I will answer the question of all time that is such a mystery to the world. Intelligent people understand that people are people and things like this happen in every group of society but usually rather pretend not to be able to figure it out so that they can have the ability to mock Christianity.
Some people do things that are contrary to Christianity because:
1) they really aren't Christian (they THINK they are and CALL themselves "Christian" for their ego and to redeem their conscience and to gain status as being righteous, but are really only self-righteous).
2) they TRY and fail (they don't really have LOVE in their heart because they were taught that faith doesn't have to be borne from LOVE, God is not faith, "God is love...", 1 John 4:16).
3) they really were SINCERE in their heart, but found false teaching that allowed them to continue doing whatever they want more comfortable (human nature).
It is very common that people enjoy mocking Christianity, but the people that enjoy doing so, do it because TRUE Christianity (righteousness) mocks and offends their conscience.
It is a matter of self respect (pathetic cowardice).