The Jews didn’t invent their beliefs out of whole cloth—this is true whether it’s Judaism or communism (Karl Marx, Lenin, and most Russian communists were Jewish though I think you know that already). They borrowed monotheism and a bunch of their religion from local religions at the time. Jewish communists learned a great deal from the French Revolution. They put a Jewish stamp on these beliefs so to speak, then handed off some of those beliefs to other people who, like the Jews before them, discarded what didn’t make sense to them and kept what did. China is barely communist now, by Russian standards, it’s more fascist to be honest.

Another good example is how in modern Protestantism they talk a lot of about “the biblical definition of marriage,” when what they really mean is one man and one woman—more of a northwest European definition. The biblical definition of marriage is one man and one or more wives. But you can’t get a modern Protestant to accept what the Bible says because everyone reads their own beliefs into these religions.

There is no discernible ultimate source to any religion—it’s more like a chain of beliefs, where people take their existing beliefs and project them onto their religion.

Having said that, Hinduism is is a chain of beliefs that has stayed within the same ethnic group for a very long time, which maybe is what you’re saying? And that is indeed something rare and very precious.