Atheism and agnosticism are not religions. And he did mention them. And the Roman Catholic Church has made a deliberate, organized, and official effort to aid and conceal pedophiles from justice. It's hardly a 'stereotype' so much as 'official church policy'. And while the Church of Jesus Christ and Latter-Day Saints has officially declared polygamy a no-go, there are still some fundamentalist Mormons who engage in it.

Honestly I think you should go take the piss out of the religions. You're going to offend people anyway, because that is how most religious folk are. Might as well go for maximum satirical and comedic value, then.

Reminds me of that short story based on the War in Heaven I always meant to write but never did...