Attacking religious groups is perfectly fine, not bigoted and not comparable to bashing based on race, gender or sexual orientation. That's because religion is a chosen trait that one decides for themselves, unlike the other traits. Its more comparable to bashing and attacking members of a political party.
Be careful there. Hate speech and discrimination laws apply to religion and religious groups, too. Clever parody can be a way to avoid crossing into bigotry, but banal attacks on religion can be construed as hateful or discriminatory and would then be against the ToS.