Alright, supposing God missed a few. Genesis says they were "ancient men of renown, of whom legends are told."
They are powerful in their own right.
But "legends", "ancient men" inplies they were old during Noah's time.
Sumerian legends tell stories of great battles between forces of good and evil.
Sounds like the same events, in different ages, happening over and over.
Just my opinion.
Of course, there are also translations that pre-date Sumerian texts, that describe aircraft.