One of the biggest questions about this is how something non-material can affect material.
I believe there are some who agree with this and say that the entire material world is an illusion, but let's stick with the dualist view for now. I think the typical argument is that we know the limitations of material substances better than the limitations of non material substances. We can do experiments on matter and have scenarios like Mary's room that make it seem unintuitive matter could be the sole starting point of consciousness.
Meanwhile non material stuff isn't super strictly defined, it can literally be anything that's not material, like God or the Force. We might have empirical reasons to believe material substances typically just affect other material stuff, and we can usually account for causes and effects, so consciousness seems like an unexplained exception. But if there could be non material stuff we haven't encountered, then it might be able to affect anything. Telekinesis for example is non material but would hypothetically affect material stuff. We haven't studied anyone who has it so we don't have anything similar to Mary's room in that regard.
I do think attributing consciousness to God requires a bit more work than just saying "Mary's room." But if what we call physical stuff almost always only causes x, and we see something that isn't x, it makes sense to attribute it to some other category of thing. I think that's pretty standard hypothesis generation.