What Happened to the Non Jews Who Died Before Jesus Came?

[watchamadoodle]

OK Norm, Let's begin in the pre-flood world.
The fallen angels had bred with women given birth to the Nephelem, part human, part demonic.
The result was catastrophic evil and bloodshed, it was stated that the inclination of every heart was evil- and that- continually.

Noah, however was genetically uncorrupted, we do not know about his kids or their wives or his wife.
Something must have gotten thru because the tribes that occupied the land of Israel were described as "Vampire-like demons"
and, just as in the Flood, were wiped out by command of God (this time by Israel).
Satan's desire was to corrupt ALL of humanity, thus killing God's plan.
...

If bad behavior results from bad genes, then wouldn't it have been better for God to cleanse the Earth using a virus that only infects people with bad genes?