I hope that helps. Big Theological Debates on the imminence or existence of God are no more important to Zazen than whether there is a chair in the room or not while sitting is sat.
Imagine sitting Zazen on a Zafu resting upon a Golden Chair, which holds and supports us.
Now, imagine sitting Zazen on a Zafu with the Chair sitting across the room, somewhat distant.
Imagine sitting Zazen on a Zafu with the Chair outside the room in the garden, hard to see.
Imagine sitting Zazen on a Zafu with no Golden Chair, never was one and never will be. (Atheism)
Or maybe you have doubts about whether the Golden Chair is there or not there. (Agnosticism, Jundo's approach)
Or, imagine that there is Only the Golden Chair, and everything ... you, the Zafu, the room, the garden ... rests comfortably inside it, in fact, IS the Chair.
Well ... where is there not sitting? How is sitting Zazen in any way prevented by where the chair is, or is not, or never ever was?
Someone might believe that the chair is all, or under us, or far away or never was here at all ... and such is just what is. Sitting. We Zen folks are fine where or however the Chair is, or there being no Chair at all.
Anyway ... while any of the above may or may not be true ... simultaneously, in the dance of Wholeness ... what separate you? what zafu? what room? what garden? what distance? what gold? what Chair?