We have no proof of this. As you once argued with Stile, there may be a "place" we've overlooked or not examined. Your "all" is tentative at best.
I said in Message 53, "All concepts - including God - are conceived by humans." That has nothing to do with the reality of God or whether we might some day find evidence of God.
You said in Message 40, "While the ideas about God were written by humans, God the concept is Himself Creator of all things---including humans." The concept is human imagination, period. Whether or not there is a God, whether or not we ever find evidence of Him, the concept is entirely made up by humans.
If we ever did find evidence of God, our concept of Him would likely change a lot.
John 20 says the room was "closed". (I would guess thst locks were fairly rare in those days.) And it just says Jesus appeared in their midst, nothing about walking through walls. There's no reason to conclude from what it actually says that He had any new voodoo super-powers.