What sort of proof are you looking for?
How about the countless people tortured and killed for the sake Christianity (Islam, Judaism, etc)? This goes both ways. There has been harm done by Christians (Moslems, Jews, etc) to others and there has been harm done to Christians (Moslems, Jews, etc) by others. None of those people would have suffered their fate if Christianity (Islam, Judaism, etc) did not exist.
(What is Luvit's test?)