I didn’t actually watch much of it, just was looking for the worst rap song I could find. Kind of surprised to hear they did that.
I think it’s at least so bad that it’s good. They don’t call Jesus their “er”, they’re referring to him as a “niBBa” endearingly, and even so, that’s part of the joke. The joke is that these out-of-touch old white people are saying “niBBa” the same way a young black rapper may say it.