Christianity is a very weird one. For example, the Christianity that emerged in the period was what we call Orthodox Christianity, and is very different from Catholicism.
Same tree/base class. Orthodox/Catholic/Protestant diffs are no bigger than Shia/Sunni or Mahayana/Theravada or Vaishnavism/Shaivism. In fact the range of Christianity is narrower not wider.
I can't speak about Shia/Sunni splits nor the other ones. But the basic beliefs of Orthodoxy are very different from Catholicism. And I feel I have more in common with a Buddhist than a Mormon. And I can't even begin to understand Evangelical Protestantism.