Sound natural disposition..
Monotheism is the core of the messengers’ call and the mainstay of their message:
{Say: “It is revealed to me that your god is only one God. Will you then submit to His will?”}
[Surat al-Anbiyā’: 108]
{Say: “I am only a man like you to whom it has been revealed that your god is but one God; so take a straight course to Him and seek His forgiveness.” And woe to those who associate others with Allah.}
[Surat Fussilat: 6]
Establishing monotheism and affirming the obligation of devoting the religion sincerely to Allah, Allah Almighty says:
{And they were not commanded except to worship Allah, [being] sincere to Him in religion, inclining to truth, and to establish prayer and give Zakah. And that is the correct religion.}
[Surat al-Bayyinah:5]
Moreover, Allah Almighty ordained submission and humility to Him as the One and Great God:
{...For your god is one God, so to Him submit. And give good tidings to the humble [before their Lord].}
[Suratal-Hajj: 34]