Why did the original Christian church split into the Orthodox Church and Catholic Church?

The schism between the Catholic Church and the Orthodox Church is one of the most significant events in Christian history, unfolding over several centuries and shaped by a complex web of theological, cultural, and political differences. Initially unified under the banner of early Christianity, the churches began to diverge with the rise of the Roman Empire's endorsement of Christianity as the state religion. This pivotal moment set the stage for the evolving roles of their respective leaders—the Pope in the West and the Patriarch in the East.