'La ilaha illa Allah

وَقَالُواْ ٱتَّخَذَ ٱللَّهُ وَلَدٗاۗ سُبۡحَٰنَهُۥۖ بَل لَّهُۥ مَا فِي ٱلسَّمَٰوَٰتِ وَٱلۡأَرۡضِۖ كُلّٞ لَّهُۥ قَٰنِتُونَ

It means,

And He says

رَّبُّ ٱلسَّمَٰوَٰتِ وَٱلۡأَرۡضِ وَمَا بَيۡنَهُمَا فَٱعۡبُدۡهُ وَٱصۡطَبِرۡ لِعِبَٰدَتِهِۦۚ هَلۡ تَعۡلَمُ لَهُۥ سَمِيّٗا

It means,

وَقَالُواْ ٱتَّخَذَ ٱلرَّحۡمَٰنُ وَلَدٗالَّقَدۡ جِئۡتُمۡ شَيۡـًٔا إِدّٗاتَكَادُ ٱلسَّمَٰوَٰتُ يَتَفَطَّرۡنَ مِنۡهُ وَتَنشَقُّ ٱلۡأَرۡضُ وَتَخِرُّ ٱلۡجِبَالُ هَدًّاأَن دَعَوۡاْ لِلرَّحۡمَٰنِ وَلَدٗاوَمَا يَنۢبَغِي لِلرَّحۡمَٰنِ أَن يَتَّخِذَ وَلَدًاإِن كُلُّ مَن فِي ٱلسَّمَٰوَٰتِ وَٱلۡأَرۡضِ إِلَّآ ءَاتِي ٱلرَّحۡمَٰنِ عَبۡدٗالَّقَدۡ أَحۡصَىٰهُمۡ وَعَدَّهُمۡ عَدّٗاوَكُلُّهُمۡ ءَاتِيهِ يَوۡمَ ٱلۡقِيَٰمَةِ فَرۡدًا

It means,

And He says:

 قُلۡ هُوَ ٱللَّهُ أَحَدٌ ٱللَّهُ ٱلصَّمَدُ لَمۡ يَلِدۡ وَلَمۡ يُولَدۡوَلَمۡ يَكُن لَّهُۥ كُفُوًا أَحَدُۢ

It means,

[Al-Ikhlas 112: 1-4]
Anyone who would accept one defect in the God he worships—in the God he should honor
and magnify, placing His acts above the actions of his fellow human beings or any other creature
that Allah has formed from nothingness—would not surprisingly be found accepting other
defects in his God and Creator. In fact, he would be finding fault with the God that he himself
worships.
Human beings and other creatures that Allah has brought into existence out of nothingness
marry, have babies, multiply, die and are brought to justice at the reckoning. Then, by the will of
Allah, the Mighty and Majestic, they either enter Heaven or Hell.
To those who accept that Allah, the Glorious and Exalted, had a human son or that He has a
special relationship with them, we say to them in rebuke and denial:
a) Who's to say that Allah, the Mighty and Majestic, does not have a son from among the
angels or that He does not have a special relationship with them? They are from the
Heavenly Hosts and Allah Almighty created them from light, so they are more noble in
creation than human beings who were created from clay.
Who's to say that He has does not also have a son from among the jinn (a parallel
creation made of fire) or that He does not have a special relationship with them as well?
This is just to deny the Christians' false claims and blasphemous lies against Allah
Almighty.
Jinn are also creatures of Allah Almighty; He created them even before He created human beings. 

b) Who's to say that Allah, the Mighty and Majestic, did not create anything besides men
and jinn that we have no knowledge of? How do we know that they have not taken third
and fourth sons or that Allah Almighty does not have a third or fourth special
relationship with them?
We say this merely to refute the Christians' lies and false accusations against Allah, the
Mighty and Majestic.
c) Who's to say that Allah has not taken a wife or companion from mankind, the jinn, or
any other creature?
We say this just to clarify the things the Christians say about Allah, as well as to censure
and rebuke them.
d) What is there to prevent anyone from accepting any of the other attributes and actions
that are not befitting of Allah, the Glorious and Exalted—that detract from His Glory
and Majesty—when He is his God that he worships and Whom he should defend from
fault and glorify above all others?
Once again, I say this merely to rebuke them and refute their blasphemous lies.
e) If Christians believe that Jesus is the son of Allah because he was born with no father,
then what do they say about Adam who was created without father or mother? Do we
call him a god or the son of a god?
Again, such statements are made only to prove the full impact of that which the
Christians say and to rebuke them for it. Allah is far above such tragic accusations.
The evidence to prove the Majesty of Allah is so abundant as to be uncountable. The Christians'
belief in their God is unclear and impure—it is a belief that cannot be accepted by anyone of
sound nature or rational mind.
Indeed, they are no different than those who worship cows or anything else. They worship a
human being created by Allah Almighty and ascribe Godhead to Him (or part of it, according to
their varying denominations) because of the falsehood they have immersed themselves in. The
human they worship is the Messiah, who was carried in the womb of the Virgin Mary—who was
most certainly human—for the duration of her pregnancy. Thus, to refute and censure them, we
say:
a) How could the merely human Virgin Mary have carried in her womb a god or the son of
God?
b) How can a lower being contain a higher being? And what is this corrupted, muddied and
unclear belief system that no sound mind could ever accept?
c) What if a man married a cow? What if the human nature met and joined with the animal
nature? Would what is born be half human and half cow? Does it make any sense for the
divine nature to mix with human nature?
Surely a rational mind and a sound nature could never accept any of these claims,
falsehoods and lies. Allah, the Mighty and Majestic, is the Creator who brings form out
of nothingness and his attributes are unlike those of His creations.
What could make Him do that when He creates what He wills? And how could the
'son' of God be left to be crucified, killed and humiliated without protecting Himself?
How could God let His 'son' be crucified, killed and humiliated by the Jews who
disbelieved and denied Him, under the claim that this would be a cause for the
forgiveness of the sins of all human beings, though He Himself was not responsible for
their sins?
What could possible make Him do that when He is the Creator Who holds the power
to forgive and pardon without the least need for all these stories the Christians have
made up?

Does it make any sense that all men and women would be held responsible for their
father Adam's disobedience to his Lord, the Mighty and Majestic—the sin of eating from
the forbidden tree?
Does it make any sense for the son to bear the sins of the father or even part of them
when he has no relation to these sins? Is this the divine wisdom and justice that we must
glorify and declare void of any unbefitting attributes?
How strange is that? What grave could hold the God of the heavens and the earth?
Indeed, a rational mind and sound nature could never accept even the least of such lies and
blasphemies about Allah, the Creator, Maker, Shaper and Owner. May Allah be exalted above all
of these offensive charges.
Whoever worships cows—or any other created thing—attribute divinity to it. Falsehood has
many faces. What the Christians say is similar to what the Jews say, similar to what the cowworshippers
say, similar to what the idol worshippers say, and so on. All of them make partners
and equals with Allah. They are also the same as the atheists who deny the existence of Allah
Almighty. They all disparage and find fault with Him, may He be glorified in His exaltation.
Allah says:

وَمَا قَدَرُواْ ٱللَّهَ حَقَّ قَدۡرِهِۦ وَٱلۡأَرۡضُ جَمِيعٗا قَبۡضَتُهُۥ يَوۡمَ ٱلۡقِيَٰمَةِ وَٱلسَّمَٰوَٰتُ مَطۡوِيَّـٰتُۢ بِيَمِينِهِۦۚ سُبۡحَٰنَهُۥ وَتَعَٰلَىٰ عَمَّا يُشۡرِكُونَ

It means,

And also:

بَدِيعُ ٱلسَّمَٰوَٰتِ وَٱلۡأَرۡضِۖ أَنَّىٰ يَكُونُ لَهُۥ وَلَدٞ وَلَمۡ تَكُن لَّهُۥ صَٰحِبَةٞۖ وَخَلَقَ كُلَّ شَيۡءٖۖ وَهُوَ بِكُلِّ شَيۡءٍ عَلِيمٞ

It means,

وَقُلِ ٱلۡحَمۡدُ لِلَّهِ ٱلَّذِي لَمۡ يَتَّخِذۡ وَلَدٗا وَلَمۡ يَكُن لَّهُۥ شَرِيكٞ فِي ٱلۡمُلۡكِ وَلَمۡ يَكُن لَّهُۥ وَلِيّٞ مِّنَ ٱلذُّلِّۖ وَكَبِّرۡهُ تَكۡبِيرَۢا

It means,

And He says:

 قُلۡ هُوَ ٱللَّهُ أَحَدٌ ٱللَّهُ ٱلصَّمَدُ لَمۡ يَلِدۡ وَلَمۡ يُولَدۡوَلَمۡ يَكُن لَّهُۥ كُفُوًا أَحَدُۢ

It means,

 

The Prophet Muhammad (sws) said, that which means,

The truth is one; there can be no difference over it among clear-headed, sound-minded,
reasonable people, and that is the message with which the Prophet Muhammad (sws) was sent:
that there is no true god but Allah. He has never had a son, He has no partner in sovereignty, He
has never been lowly and in need of a helper, and He has no supporter, minister, counselor or 

ally. He is the Mighty and Majestic, who creates everything, and plans and enables everything by

His Leave. He was not begotten nor does He beget and there is absolutely no one equal to Him.
Just as Allah, the Glorious and Exalted, was not begotten, for He is the Alpha—the First
before all others, He has not begotten any other. He is not in need of anyone else, for He is the
Omega—the Last, after all others. May He be glorified and exalted, for there is none like unto
Him at all.
The truth is that Jesus (peace be upon him) is Allah's slave and messenger, and he came with
the same message as the last and final messenger, Muhammad (sws), without excess or
negligence—without the exaggerations of the Christians who ascribed divinity to him and
without the neglect of the Jews who insulted and denied him, calling him a magician and the son
of a whore.
So, man should use the reason Allah has bestowed him with and let that be a step towards
recognizing the greatness and power of his Creator. He should contemplate the wonders of
Allah's work, glorifying and exalting Him above all others.
Jesus (sws) has miracles that witnessed his prophecy like other messengers. The Negus, the king
of Abyssinia (currently Ethiopia) was a Christian. He embraced Islam after he understood the
instructions of Islam. When Prophet Muhammad (sws) learned that he was a just king, he asked
some of the Muslims to immigrate to Abyssinia to protect themselves and their religion from the
torture and persecution of Quraish (the chief tribe in Mecca at the time) because of their new
faith.
Some of the companions of the Prophet (sws) fled to Abyssinia, but no sooner had Quraish
learned of that, than they chose two of their most steadfast and clever men (who both later
became Muslims incidentally). They sent with them rare and curious gifts for the Negus and his
counsel so that they would turn the Muslims over to them. Indeed, Quraish were insulted that
the Muslims had found a safe place to escape with their lives and their religion and they were
determined to bring them back to their people and their land so that the polytheists might make
an example of them.
To make a long story short, after the Negus refused to turn the Muslim immigrants over to
them (for he was a just king, an excellent neighbor, and no one was mistreated in his country),
the two men tried to turn him against them. The following day, one of them, whose name was
Amr ibn al-'As (he later became a Muslim), said to the Negus, "Oh king, the Muslims say a
terrible thing about Jesus, son of Mary." So the Negus summoned them and asked them what
they say about the Messiah. They were mortified, but they came together and decided to be
truthful, no matter the consequences.
When the Negus entered the room and asked them, Ja`far ibn Abi Talib (the cousin of the
Prophet, sws) replied, "We say about him that which our prophet (sws) has told us: Jesus is the
servant of Allah, His messenger, a spirit created by Him, and His word that He bestowed upon
the Virgin Mary."
So the Negus took a stick from the ground and said, "By Allah, Jesus, son of Mary is nothing
more than this stick." His counsel snorted, but he blamed them, saying, "Even if you snort, by
Allah!" Then he told the Muslims, "Go, for you are safe with me—and he said the word 'safe' in
the language of Abyssinia—whoever bothers you will pay, whoever bothers you will pay. I would
not like to have a mountain of gold if I harm any man among you—and he said the word
'mountain' in the Abyssinian language."
Then he told his retinue, "Give the two men back their gifts, for I have no need of them. I
swear by Allah, Allah did not take a bribe from me when He returned my kingdom to me so that
I might take bribes concerning Him, and the people have not obeyed me so that I might obey
them concerning Him."

Umm Salamah, who was one of the immigrants and the narrator of this story, said,

"Thus, the information with which Muhammad (sws) was sent concerning Jesus, son of Mary
(peace be upon him)—that he was Allah's servant and His messenger, chosen by Allah, the
Mighty and Majestic, to deliver a message just as other messengers were chosen—this is the path
of moderation, without excess or neglect, without the exaggeration of the Christians who
ascribed divinity to the Messiah, Jesus, son of Mary (or at least partial divinity according to the
variances between their misled and misleading denominations). They differed in their creeds,
though they should have been united by one creed. But why would this happen? The answer is
that falsehood is many shades of darkness, while the truth is one. Like light, it does not differ
because it is clear to the rational mind and the sound nature.
Indeed, Muhammad's message (sws) is the path of moderation, without the ingratitude of the
Jews who completely denied the message of the Messiah, Jesus, son of Mary. They rejected him,
tried to crucify and kill him, and they attempted to disgrace his mother, the Virgin Mary, just as
they have soiled the reputation of every prophet sent to them.
In general, the belief with which the last and final messenger, Muhammad (sws), was sent is the
correct belief for all people, everywhere, without tormenting the thinking, forcing the mind or
wearing out the imagination, for the Arabs and everyone else, be they Jews, Christians,
Zoroastrians, and so on—from those who worship anything beside Allah or ascribe fault or
defect to Him to those who deny the existence of Allah, the Creator and Maker, may He be
praised and glorified, whether atheists or anyone else.
That is the correct belief which would be acceptable to any sound mind that wants to know its
God—to glorify, honor and worship Him. Anyone of untampered nature embraces it without
any preparation, complication or reason for suspicion. The belief with which Muhammad (sws)
came is a clear belief; it can be accepted and understood without any difficulty or mental
gymnastics. It is the light with which Allah, the Glorious and Exalted, illuminates the darkness
and wipes away the blackness of idolatry and disbelief.