We cannot claim a religion is false if it is compatible and not in conflict with natural law.
We can claim it is literature: myth. And that the literature contains truths so far as those truths consist of statements reducible to natural law.
To require literature be compatible with physical law is unnecessary in so far as it remains compatible with natural law.
In this sense the Greeks, Chinese, and Japanese developed reasonable approximations.
It was the Zoroastrian monotheists that conflated politics and religion and in doing so created the ills of religion.
Certainly the stoics, epicureans, Aristotelians, and Roman law,and pagan nature worshippers ruled.