I agree with your comment. There has been a cover up in regard to the creation, they don't want it to get out ! I believe in the bible and the account given -literally ! Fallen angels took the daughters of earth and had intercourse with them and produced the giants - nephilim. They had great knowledge and expertise and built many of the ancient worlds megalithic structures, like the pyramids etc. This is a fascination study in itself about the technology of the pre flood inhabitants of earth. God had to destroy these people because they had corrupted the DNA hence (hence the flood)
Angelic intrusion into the God's world had to be stopped (creating hybrids)... God took Noah as his family had not been corrupted and began again with him, the messiah had to come down through this un- corrupted line of descent. "as it was in the days of Noah so shall it be before the coming of the son of man" - giants re emerging again in the last days ?