"Amen" - Ancient Egyptian Roots?

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That is a remarkably superficial (but far too typical) portrait of Israel's ethnogenesis.

I'm no expert on the subject, so please add whatever I missed or forgot in the explanation. I also wanted to keep it simple and not go too deep into the earliest accounts of Judaism as such, because the history gets extremely complicated really fast. Do add whatever needs to be added if you feel the answer isn't enough to danieldemol's question.