|P is for Practical|
I'm not going to get into logical pedantry with you, I tired of that long ago.
However, you seem to have a very odd conflation regarding race, sex, and religion. Yes, mocking someone because of something so trivial as genetics (race and sex, for example) is pretty small-minded. However, choosing to mock someone's choice, as with religion, is rather not the same thing.
Further, any set of beliefs that results in one being unable to laugh at oneself a little bit is dangerous. That said, I see no problem with you being offended at the "galloping gay christ" joke -- what I have a problem with is your presumption that since you were offended (and other people might be), that the OP should be sanctioned.
As an atheist, I put up with all manner of "offensive" jokes about my lack of belief. Most of them are extremely funny. On the occasion someone makes a joke I feel is too inappropriate, I will approach them in private and explain why I felt they went too far. However, I would never suggest that they be sanctioned, or their comments removed from public fora.
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