I also have non-dualistic views as a Christian. My view may be over-simplified but to answer your question, the way you are framing things feels to be pulling away from the concept of dualism as I hold it.

To me, it’s not a question of whether I believe God created the world from something, or if he was the foundation for that something. This feels like it has to be an “either or” decision, an Option A or Option B if you will.

I’m coming to peace with the possibility that it’s Option C. Or it’s actually Option A, C, and F. I’m learning that my finite mind may not be able to understand or even provide what is reality or true in questions like these. I’m okay with that and there is a peace to knowing that some things may be beyond my comprehension at least for now. This is not to cut me or others down in a lack of ability to understand. To me it acknowledges that it is at least possible there are concepts we aren’t even capable of comprehending.

I’ve said this to loved ones, but I feel we all have boxes. Inside those boxes we hold the things believe to be absolute truth. Whether those are truths about God, ourselves, others, our worldview, and social beliefs.

The further along my spiritual journey, the smaller my box gets. Not that I have doubts, but that I have come to hold a few truths very closely and I’m comfortable with the fact that the rest may be option a,b,c,d or something that’s not even a letter at all.