Though that declaration is, at best, faith-based speculation and belies the possibility that, at the start, God is no more than a humanly contrived projection.Well, man needs God for existence itself, so I don't think that has legs....
As such, God would indeed be contingent upon man.
....but it does lead to an interesting question. If God is perfect it goes for some that He cannot need anything, being complete. But if love in perfection is a thing that gives and does, how could He be complete in the manifestation of His nature, which love would appear to compel, without an object upon which move?
Better question, is what you've abstrusely set out here merely the very product reflecting back upon itself?