A god, by most accounts I read, is the sort of thing that is confirmed to exist by sensation. One does not need any elaborate metaphysical proofs to know it. Just walk up Olympus and look, or wait for them to fly down into a battle. It is a matter of observation and, in the broad sense, data collection. This is why a thomist would place the question of their existence in natural science among things existing with sensible matter and defined with it. They would have a special kind of matter, no doubt, like we impute to atoms and the ancients imputed to the celestial bodies, but it would have some direct relation to the sense powers.