Hmm well your axiom
God is infinite..

violates your whole proof so nice try but it's a definite no go..

axiom : God is Infinite
predicate : God is Inifinite If and only if God has no mass

otherwise God would take up all mass and there would be no stones.. :) (this was your argument not mine.. that a stone can't be infinite mass or god would be gone. , which is contrapositive to this this proposition)

nice try though..
So.
if god is infinite , he sure must be massless, energyless too for that matter..