then ask yourself why there are so few female atheists

This makes no sense at all. You are referencing an individual comic strips use of a word as the reason for a lack of female presence in atheism. Which first of all is not true. Second, it does not even compare to the scriptures of all of the major religions offences in this area, that are chauvinistic, homophobic, and just plain ignorant.

Jokes are meant to not be taken seriously. Religious Scripture is the foundation for these so called morals.

The use of the word Slut here, is in the context to suggest that God is not really this uptight guy portrayed in the bible and could give a flying fuck about morals in the traditional sense, and actually uses the bible to keep the 'flock' out of heaven because they didn't think for themselves. Jokes by their very nature must slight someone or something or they wouldn't be much of a joke.

I grew out of knock knock jokes and the kind they print on Popsicle sticks years ago. Higher comedy needs to sink low to properly expose the reality that we live in. I am not going to say that words don't mean things, because they most certainly do but sometimes the use of a word can be in light of itself. It is not for you to lease out or tell people who can and can't use it in what context. The use of the word slut is fine because it is a concept that exists within our society, also it suggests that only 'Sexually Free' Women get into heaven. Don't turn to comedy to break grounds for standards and practice, because I can guarantee that You are going to have a bad time. the bluest comedy is most often the truest if you don't flip your shit before the punchline. Comedy is the fun house mirror of reality, it can only reflect what is there already but sometimes it blows things a little out of proportion.