So are you saying before Adam humans didn’t have free will? Could you please define what you mean by “free will”? And what would you expect to see in human behavior if they didn’t have free will? BTW, I identify free will with the truly selfish behavior that only humans seem to exhibit.
As to the beginning of humanity, I believe it can be dated to roughly 50K years ago when there was the sudden appearance of modern human behavior in Africa which then spread out over the rest of the earth. Some of this behavior could be considered enhanced behaviors that are seen in other animals. However the one thing the strikes me as different from other animals is in a sense of an afterlife. I believe this is the indication that humans were now created in the image of God. This belief in an afterlife would impact the development of a moral sense (or sense of law) and also the awareness of what would come to be known as God. As of yet there is no indication of how this happened in a biological sense but even if science does finally come up with the cause I still believe it was due to God.
That basis would be only humans can response to the Holy Spirit when he reveals God’s truth to each of us.
Isn’t this just a little bit over the top?