Paganism vs. Monotheism

[Pyrrho]

I guess they're less harmful because none of them have the social/political clout of the major monotheistic religions. As to credibility? No difference in my opinion. None of them have any. All the religions are clearly human-invented.

There is a great deal of difference in credibility between, say, Christianity and the ancient Greek religion.  The problem of evil proves that Christianity is a lie, but does nothing to disprove the ancient Greek religion.  In the ancient Greek religion, none of the gods are omnipotent, none are omniscient, and none are perfectly benevolent.  So the ancient Greek religion, while still implausible and not worthy of serious consideration, is more plausible than Christianity.