ICP are essentially Evangelical Christian hip hoppers that are allowed to talk about bad stuff using bad words in a quasi-Marilyn-Manson-esque way.
Everything else goes hand in hand with any hip hop group -- delivery, talent, etc. -- that you'd see on the Trinity Broadcast Network... creationism, ignorance is bliss, and all that.
It makes their cult status and their being a target of humor less surprising, but still funny nonetheless.
I'm no student of ICP but I thought the religious/Christian turn was a relatively new thing.
I know this isn't the same as scientific proof or living with Violent J himself. But I have a friend who's an ICP-ologist, for lack of a non-corny term, though not a juggalo. "Miracles" is allegedly a return to form, and/or at least a return to their original producer. The religious thing was there from the beginning of their formation as Insane Clown Posse. They were originally called Inner City Posse... in brief, wrestling, beefs with other rappers, gang life summed up Inner City Posse. The "Insane Clown" part replaced the name for the two when they were first 'reborn.'