If you read The American Religion by Bloom, he makes frequent mention that Mormonism, as taught by Joseph Smith (not so true today in modern Mormonism), is a reinvention of Jewish and Christian Gnosticism.
It's not that JS had access to these ideas or works, but rather it was his "religious genius" that allowed him to recreate/reveal them.
I'm not sure that Bloom argues that similarities would be proof of God's revelation. But it's interesting nonetheless.
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