Reading the early Christian church leaders was enlightening, as a member of an evangelical church. My church didn't really have any answers when I asked why our practices/beliefs diverged so intensely, which was somewhat disappointing. The writings of the early Christian leaders are filled with Greek philosophy, genuine debates about theology, and a ton of wisdom for both believers and unbelievers.
Try reading the bible with a Greek Orthodox Priest. Their insights from reading it as written and not from a vibe based translation, their knowledge of the background, have been some of the best theological discussions of my life. I used to go to a bible group with a Greek Orthodox Priest and he would just demolish the evangelicals and their strict interpretation of the english translation.
Given the borrowing of ideas, why then do modern Christians, including evangelicals, dismiss other cultures so aggressively? For example Greek and Roman beliefs in god are described as “pagan”, which is a negative term. And obviously evangelicals are very hostile to other faiths even today, whether it’s Buddhism or Islam or Hinduism or whatever.
What's the answer? Why have they diverged so much?