Also, but not just, if we consider classical theism (pantheism), then there would be nothing that God isn’t. As God, if we would think of God as the foundation of all being, could not be anything that isn’t. Since what isn’t is without foundation.

Also, but not just, if we accept panentheism, where God is everything that is and isn’t.

Basically the only time that anybody would accept God as ‘made out of atoms’ is if that person accepts the inherently and explicitly atheistic view of metaphysical physicalism. Arguing for God from physicalism is like arguing for social healthcare as a (US) republican. There is an inherent disconnect between the two.