Quite the contrary, Christians are extremely homogenous. By the by, I was raised Christian so don't think I just don't understand. I have left the church and deconstructed because I just couldn't stand the hypocrisy any more.

Anyway, Christians are homogenous for a few reasons. You have the same Holy Book that had been heavily redacted from broader Holy scriptures, writings, and knowledge.

The choices for New Testament Books were heavily skewed in favor of Paul's letters forming the new church. Paul was a Roman citizen and never sat as Jesus' feet and learned from him so this choice in lieu of more writings by Peter, for example, is a little odd. Christians have strong authoritarian tendencies because of this choice sometime prior to 500 C.E., probably the Council of Constantinople (there's debate). It's in the language and his often militaristic use of metaphors. Jesus, on the other hand spoke in language and metaphor of occupations and growth, farming, fishingz, shepherding, building, etc. As such, a lot of the nuance of meaning in Jesus' parables has passed from common knowledge. These occupations have shrunk in terms of people who know them and they're heavily mechanized now. Plus, the basics have further changed in the of vocabulary, weights, and measures. Contrarily, the basic parlance of military vocabulary is much the same. Even with more professional armies, gaming keeps the language fresh in the public's mind. Everyone knows what armour and swords are for and what makes good armor and swords. Not everyone knows what a cubit or an awl is or why shepherd staffs have hooks of why and how to scatter mustard seed. The result is that over the years, all Christian branches and churches have become more militaristic and authoritarian of thought and practice and less like Jesus, despite the constant hypocritical and yammering rhetoric of love and charity. The only question is who is going to be ostracized, judged, or persecuted.

Every church has done evil in the name of Jesus. Every single one, with the possible exception of the Unitarians/Universalists. I say possible because to my knowledge and to many other more scholarly folks than me who gave written of them, they have never been accused of atrocities. That doesn't mean it didn't happen. It means maybe it didn't happen but if it did, it's not widely known and isn't being discussed. That church gets a lot of hate from other churches because they are truly open to everyone, including Wicca and Luciferians, so long as one is willing to tolerate, respect, and honor everyone else's earnestly and deeply held beliefs and practices.

So there's your ONE exception where Christians keep to the tenets and practice of Jesus and have historically.

All Christians believe in a Paternal, omnipotent, and omniscient God. This belief stymies personal growth and keeps Christiand from full human potential. You're lazy and indolent toward your fellow man and your responsibility of stewardship for the planet. If you've ever seen Star Trek Voyager, Christians are like the Ocampa, Kes' species. "Sky Daddy" philosophy keeps you from personal growth. As long as there is this loving Father who is in control of everything, you never have to take responsibility for your fellow man or the state of the planet. If it all falls apart, it was God's will, even while it's people who are destroying our environment. Christians comfortably on the fence about a lot of things, except undermining human rights and people's autonomy. Then they tend to fight over stones to throw or stay on the fence. You said you're pro-choice? Okay. But if your church leadership starts talking or acting via political involvement or funding anti-abortion do you demand the Conference remove that preacher or call a quorum to change leadership? Do you leave that church, depriving them of your tithes to harm your fellow human beings? Do you make it known why you are leaving? I know that fence is comfortable, but there's a difference between talking the talk and walking the walk.

I could go on, but this is getting too long. The differences between Christians is largely semantics. In every way that matters with how they relate with the world,.they are VERY homogenous.