That would also neatly accounts for a god's omnipresence, participation and interest in the affairs of men, eternal and necessary existence, omniscience (maximal available knowledge), and omnipotence (maximal available power). It may be a stretch to say "god is literally gone", as it would just be transmuted. "Supreme being" would apply equally to all mankind taken as a whole. But yes, many monotheists (who typically have fairly dogmatic notions of a god) would likely find that troubling. The idea that self-sacrifice of one's own individuality is necessary for "becoming One" seems to be a fairly common misunderstanding. That would imply that one's sense of self had to somehow end, and with it, any sense of oneness. Instead, sense of self would merely expand. It would be just a matter of what one refers to as "I" encompassing more. "We" becomes "I" in a seamless transition, where the internal lives of others (previously isolated from the individual) first become transparent (telepathy, for example) and then become so familiar and thoroughly understood that reasoning and motivations merge. Any two individuals so merged would both think of the merger as their own self, as complete understanding lends itself to sense of ownership (for lack of a better word).