Why did Allah not send the Prophet Muhammad (peace be upon him) and reveal the Qur’an from the beginning of humanity to prevent people from differing?

Disagreement among humans is a reality that has existed since the dawn of humanity, as indicated by the Almighty's saying: "Mankind was one community, and then Allah sent forth prophets," and His saying: "And they will continue to differ." All prophets called to Islam, meaning submission of one's face to Allah through monotheism and obedience. Their laws agreed on fundamental principles but differed in some details. The mission of Prophet Muhammad, peace be upon him, was delayed due to the universality and comprehensiveness of his message for all humanity, and because it was suitable for sealing the divine messages due to its perfection and its fulfillment of humanity's needs until the Day of Judgment, and because it came at a time when communication between nations became accessible.