If that were the case, the majority of Celestial gods would have no cults. Most of them are far too corrupt and self- important to do anything resembling divine intervention on behalf of even a fraction of the people within their sphere of influence.

There is also the fact that even with real gods, most people are never going to see them. Even elementals are rare enough that the default reaction is to fall on your knees and pray while someone runs for the local monk or shaman. People might not even be aware that there are other gods. The local lame-ass wolf god might have convinced...