The Elixir And The Stone: by Michael Baigent and Richard Leigh.

This might partially or more answer the question of what knowledge was taken from Egypt in Judaic tradition. Hermeticism, Roger Bacon, occult, being keywords here, perhaps the knowledge had gone underground for a good reason and any inquiry into it was - is, too - met with diverting attention and query, disrupting dialogue, hostility, attempt to provoke a general furor against anyone who questions into this, direct insults, and more.