Kacper Petrykowski
Kacper Petrykowski voted up Anonymous' answer

I think there are a few reasons:

1. Convert or die.  This was a common practice in the medieval period, then when we discovered native Americans, and then among African slaves.  Or, well, heck, anyone we encountered along the way we must "save".

2. The idea of pain and suffering on Earth and in life is somehow … Read more

Kacper Petrykowski
Kacper Petrykowski voted up Levi Fitzsimmons' answer

Lots for reasons for that and they are very complicated. One of the most important reasons was becoming the state religion of the Roman Empire in the 4th century. That established Christianity's permanance in the West that continues to this day.

Why Christianity over other religions of the time, like, say, Judaism? Judaism was present in … Read more