Hmmm not sure I 100% agree, BA.
Jim tends to walk a funny line between saying everyone's views are equally important and there is an objective truth to things. Which aside from being contradictory is also just frustrating. But it does make for interesting writing, to a point.
I would say he will likely explore it further, yet also probably not take too strong a position. He might get TWG or Jesus or some other Deus Ex Machina moment in, but also deliberately leave it vague. You can sort of tell when he talk about how it isn't the beings themselves that change, just our ideas about them. The whole three blind men and an elephant analogy.
But I would definitely expect him to explore Christian teachings/legends (just to be clear, legends are not necessarily myths - but they are stories with a point rather than historical notation/exposition/analysis which any theologian could tell you, doing my best to be respectful here). He has already included a number of items and embellished and invented new parts of it, so I expect there to be a fair bit more.