This is a question that has troubled a lot of people. There are so many immature and reactionary beliefs about the Old Testament it’s hard to get people to think about the Scriptures in a thoughtful and logical manner. Most don’t understand it, so they mock it – even BELIEVERS! Too often we glory in our ignorance and mistake it for “being spiritual.” Instead, let’s patiently consider the truth. Are you a believer? If you are, give God the benefit of the doubt that He has written EVERYTHING in the Scriptures for our learning – nothing is unnecessary.
What was going on at the time of the flood? There was an invasion, an angelic invasion. According to Jude these angels left their angelic bodies and inhabited flesh. The Sons of God mingled with the daughters of men and created a hybrid race.
Why did they do this? To prevent the seed of the woman from coming into the world.
What characterizes a hybrid? It can’t reproduce. The initial invasion of the Sons of God produced a line of giants/heroes. So the mingling of “strange flesh” combined with the subsequent violence of the “heroes” eventually brought about the ultimate extermination of all “pure” human beings. As a result, there was no more reproduction. Thus, no more children! By the time of Noah’s flood there were only adults in the world. Only Noah was perfect as to his pedigree – there were no angels mingled with his line.
Did you ever wonder why Noah and his family didn’t have any little kids with them on the ark? Because Noah knew the evil that was going on in the world. He was probably afraid the Sons of God would try to mix with his line. Noah walked with God. God spoke to Noah in plain language. Noah was perfectly apprised as to the situation. As a result, he, and his family held off having more kids till after the flood.
Why a flood? Because angels hate water! That’s why our Lord says the unclean spirit seeks WATERLESS places seeking rest. Angles are bound by water. That’s why God sent two floods: one in Genesis 1:2; a second in Genesis 6.
This is food for thought. There’s a lot more that can be discussed on this subject. It’s my conviction, based on a careful study of Scripture, that there were no babies or children drowned in the flood.