SGT,I completely agree with you,with everything you said.You also said God is a metaphysical concept-that proves that METAPHYSICAL God doesn't exist-there is only physical universe,everything is physical.Just think about for a second.If God exists he would already show himself,he wouldn't wait for thousands of years.The other argument is,people used to think that an thunderstorm is an enraged God,and watch there isn't God,more people discover,explain and prove new things in science there is less and less God.That's why religous people work on this way:Nenaderthals thought thunderstorm is God,now that we know there isn't God,religious people try to find God in the universe,hey but look there is no God in the universe,so they invented Theory of the multiverse as a hologram to find God.
My point is whatever you discover,you wouldn't God.If 2 milleniums of searching and scientific explorations couldn't find God anywhere what makes you think God exists?ALSO,EVERY GOD WOULD SHOW HIMSELF TO PEOPLE,IF HE EXISTS.
The other argument is about scientists:Some scientists say "we can't explain this this is God's wonder creation".
When will all people(not just scientists) learn that the biggest mistake of people is faith,because they can't explain on the other way,people are really so I'd say still too small,uncapable to understand the universe better.
God is exchange for "I don't know,i don't understand the universe enough".
Just because you don't know something,it doesn't mean that God had its metaphysical fingers on it,science has proven it's otherwise.
God is a fiction,a stitch for unknown.
Cheers!