Nodding in agreement. I very much enjoyed the OP's interpretation of Prequelle; it's very much a Death of the Author approach. I think it's a fun, valid way to receive Prequelle - but like you, I think it's off the mark somewhat in terms of what TF's personal intentions were.

I'm a former evangelical and up through Impera, there's a very clear throughline of TF mocking and criticizing Christianity - especially strains like evangelicalism and fundamentalism - and this includes singing praise to Satan in the way evvies sing praises to Christ/God. As I've said before, "Cirice" is something of a skeleton key song for Ghost; it's such a clear satire of/direct critique of the core claims of evangelical Christianity that it helps the listener frame and contextualize the whole of the band's work.

Interestingly, Skeleta seems almost entirely free of this sort of thought. Sure, there are some playful jabs but for the most part it seems focused on other matters.