If that's the case, then does it matter at all if a god exists? It becomes a purely self perpetuating, entirely abstract question like "does the future exist?"

If that's the case, then does it matter at all if a god exists? It becomes a purely self perpetuating, entirely abstract question like "does the future exist?" Also, culturally, in the majority of the "Western" nations, religion and belief in an omnipotent god are synonymous. There are outliers and exceptions, but they have little to no sway on the zeitgeist.