[Little Pig]

It would have to depend on how far back you go. According to the current evidence, “man” was pretty intelligent even as far back as 1million years ago. The med flood happened 5 million years ago, at a point when the available evidence doesn’t even show tool use.

[WorldviewDad]

I would disagree with your time line. There is no absolute proof that the earth is over a million years old let alone humans. And again God created man in HIS image. Being that God is all knowing, I would think that the first man was very intelligent (he even communicated directly with God)...even if he did mess up and cause the fall.