This is an argument for anecdote so feel free to ignore me but if you meditate for long enough or take certain substances you can experience that the conscious experience we are having doesn't actually control things in the way we think it does - you don't actually think your thoughts, you just observe them, like we don't control the sounds we hear - and same with everything else we do. The "only thing one can be assured of" is the experience, not the control of the experience.
This is completely contradicted by the fact I could talk about that experience, which does imply some control from the observer to the physical world. Which makes the whole thing paradoxical. The only way I can square it is with my religious beliefs.