here I think you went a little outside the lines ...
Well, what do you disagree with? God created Adam and Eve in a garden. Agriculture, working with wood, and the raising of animals has always been the most Christianized form of industry, because it puts man in a humble state, depending upon God for rain, good weather and protection from insects.
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The nephalim/giants were on the earth before and after the Flood. After the Flood, these people (whom Enoch describes as children of fallen angels and whom Anne Catherine Emmerich says were children from satanic rituals) came back into the line of Chaanan, who was cursed by Noah. Chaanan's descendent was Nimrod, who built the tower of Babel, which was an openly satanic structure, with anti-God purpose.
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All throughout the post-Flood Scripture, the race of Shem (i.e. the Shem-ites, or Israelites), who followed God's laws, fought the evil races of the Chaananites and all other manner of pagan races. These evil races were very advanced in weaponry, science, herbs, etc. The people of God (i.e. David) only defeated such races as the Phillistines (i.e. Goliath) by God's power, because they were, literally, giants/nephalim and had satanic knowledge of the earth/nature/science.
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If such advanced, satanic knowledge of science existed in the nephalim AFTER the flood, then it stands to reason that the same knowledge existed BEFORE the flood, since the nephalim also existed before the flood. Add to this, that mankind was MORE healthy and more intellectually knowledgeable BEFORE the flood, because God shortened man's life post-flood, as a punishment for sin.
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Thus, what Enoch describes in his book, wherein the nephalim learned all natural knowledge from fallen demons, is proven correct, by both logic, scripture and prophecy. Let's also not forget that the book of Enoch was considered part of the old testament by the Jews, even during Christ's time, since even Christ quoted the book in the Gospels. It was only left out of the canon by the Church because in the time period between the destruction of Jerusalem in the 70s til the 300s (when the bible was organized), this book was lost and the "found" copy was thought corrupt by the Church, so it couldn't be fully trusted. But it is still considered "close" to canon and can be read by catholics (with caution).