Felicjan Smolinski
Felicjan Smolinski 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