Why is Lillith excluded from Genesis?

How can I explain that Catholic teachings are true and not the result of flawed human interpetation?
Specifically when there is so much evidence that christians have edited, censored, and excluded parts of the bible that did not suit their agenda?
Who is ben sira?
How much theology does an average priest study?
I am struggling to raise a family with a strong Catholic faith, however, the information readily available to my gnostic spouse makes it difficult to defend in an educated manor.

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Is there an archangel named Uriel?
Was Lilith Adam’s first wife?

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