When it comes to the origin and nature of humanity, I am going to depart from traditional understandings. First, I think that the two accounts in Genesis of the creation of people are actually two events. The first one, on the sixth day of creation (Genesis 1:26-31) begins with a description of the creation of humans in the same terms as the creation of livestock, wild beasts, and varmints (my terminology). Then that creation account tells us that these people were to be fruitful and multiply and rule over the other animals (except wild animals) and the earth. This mandate to rule, I believe, constitutes their creation in the image of God, that is they were able to think rationally. Since these original people came before people had spirits and Jesus had a body they had to be in the image of God in some way other than physically or spiritually.
The second account, which is that of Adam and Eve, I believe, particularizes the origin and nature of current humanity. The creation of Adam and Eve marked the beginning of a new kind of humanity. It differed from the earlier humanity in that they had an indwelling spirit. As it is written in Ecclesiastes 11:5( ESV) “As you do not know the way the spirit comes to the bones in the womb of a woman with child, so you do not know the work of God who makes everything.” What we do know was that these new people had spirits that came to them while they were babies still in the womb.
These humans were also to have something new—a sense of right and wrong. This came into being when Adam and Eve disobeyed God. It also resulted in them being expelled from the Garden of Eden and forced to make their way in the “real” world and deal with their spiritless relatives. We are told in Genesis 6 how the sons of God found the daughters of man (earlier humans) attractive and the usual thing happened.
By the time of Noah, the attractiveness of the women and their culture had so overwhelmed the virtues of the sons of God that God brought about a mass extinction of humanity, except for eight people of the new type.
I think what I believe about the origin and nature of humanity is different from what you have been told or have read about. Nonetheless, what I have pictured retains the validity of the biblical accounts of creation and also allows for the prior existence of human-type people. It also takes into account the knowledge we have of the effects of mass extinctions on the overall history of life.