the mythic cults of the ancient & classical world were just social clubs for the elites. sure, if anyone asked you had to say you worshipped the same gods as the pharaoh/emperor/king but nobodys gonna ask, because youre a worthless dirt farming serf who cant read. and when the king dies a new cult is adopted. ancient monarchs didnt see the value in having a universal religion that every single citizen subscribed to, it was just an excuse to host feasts and orgies. christianity is much more consistent (literally all the stuff is in one big book) and accessible to the everyman.
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