Muslims believe that Allah is the One Who has no partner, the Creator and the Originator. Allah Almighty established the basics of monotheism [Tawheed] in the noble Qur'an. He says:
Allah - there is no deity except Him, the Ever-Living, the Sustainer of [all] existence. Neither drowsiness overtakes Him nor sleep. To Him belongs whatever is in the heavens and whatever is on the earth. Who is it that can intercede with Him except by His permission? He knows what is [presently] before them and what will be after them, and they encompass not a thing of His knowledge except for what He wills. His Kursi extends over the heavens and the earth, and their preservation tires Him not. And He is the Most High, the Most Great. [Al-Baqarah: 255]
This noble verse proves how Allah is seen in Islam; He is the One with no partner, the Eternal and Disposer of all affairs.
Islam considers knowing Allah as the principal of religion, pillar of Tawheed and the first obligation. It is reported in Sahih al-Bukhari in the chapter titled "At-Tawheed" that when the Prophet (peace and blessings be upon him) sent Mu'adh to Yemen, he said to him: "You are going to a nation from the people of the Scripture, so let the first thing to which you will invite them, be the Tawheed of Allah. If they learnt that, tell them that Allah has enjoined on them, five prayers to be offered in one day and one night."
This evidently proves that knowing Allah is the door from which every Muslim and believer must enter.
Muslims do magnify and glorify Allah. They are commanded not to curse the diets of the disbelievers, so that they may not curse Allah. Muslims also remember Allah continuously because it draws them nearer to Him and it includes their confession of the blessings bestowed upon them by their Creator.
A Muslim must believe in the Oneness of Allah, worship Him sincerely without associating partners, love Him above anything else, obey and submit himself to His commands and prohibitions.