It's because you are thinking in context of 21 century. In reality christianity was very attractive religion to many (not all!) people and in many aspects very unusual (.e.g the idea that God KNOWS your heart and can't be just fooled by some magic gestures; that people are equal, and it's not like after live slaves would still have to serve the aristocrats; etc etc etc).
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@boring7
It's because you are thinking in context of 21 century. In reality christianity was very attractive religion to many (not all!) people and in many aspects very unusual (.e.g the idea that God KNOWS your heart and can't be just fooled by some magic gestures; that people are equal, and it's not like after live slaves would still have to serve the aristocrats; etc etc etc).