So are we in the image of God yet or not? I say no.It is a prophecy, but it was also a completed work in history. It is both. He created the man, then created the woman from the man, as part of the six days of creation. The seventh day when He rested prophetically foreshadows the millennium.
But again, while I mean no offense, you are rewriting the narrative when you insert into the text that mankind was in existence before Adam and Eve, based on the premise that we must "read between the lines." What do you have to go on for this? Jewish tradition for nearly the last six thousand years now says the man and the woman in Genesis 1:27 were Adam and Eve in Genesis 4.
Where did Cain get his wife from? Why was he afraid of being killed when sent away? For whom did he build a city?
When was the plough invented according to mainstream science?