Consider Communism as idealized by Karl Marx. It denounces Religion, Marriage, Capitalism, Inequality in Weath, Selfishness and Inequality in Resources, Racism, etc. Everyone is supposed to be equal.
Its a lovely ideal that saw the murder of more people worldwide than any other ideology prior to it. What seems to start out as a lovely utopian theory gets ruined by human nature. Then again, Christianity, Islam and other religions have the same history. Their fundamental teachings are against the same things, but those things are ignored in favor of trying to forcefully spread their teachings, killing all that do not comply.
Its nothing new and mankind has made little progress. The current trend of persecution of any kind = evil could go a long ways towards world peace, but that trend is only prominent in Europe, the USA and other first world countries. Perhaps is will happen, who's to say?