The truth that God alone is the Lord worthy of worship is embedded in every soul!

Verses 172-174 of Chapter 7:

And, (O Prophet,) remind the people of the time, when your Lord brought forth from the loins of the Children of Adam, their descendants and made them bear witness about themselves. He asked them, "Am I not your Lord?" They replied, "Most certainly, Thou alone art our Lord; we bear witness to this. " This We did lest you should say on the Day of Resurrection, "We were unaware of this thing," or lest you should say, "Our forefathers started the practice of shirk before us and we were born after them to their descendants: dost Thou. then, punish us for the sin that was committed by the wrongdoers?" Behold, this is how We make Our Signs clear so that these people return to the right way.