Adam is the federal head of the race. He was not born. When he was created by God he was not created in the image of man as we know him today because there was no such man as that but he was created in the image and likeness of God. What is that image? To know that, one can examine the only other man in the OT who the scriptures says was in the image of God and that man is Jesus Christ. See it here;
In Genesis 1:27... The Hebrew word for create means to create something out from nothing. "Bara"
What was created in Genesis 1:27 were the male and female souls. Souls yet awaiting a body to live in.
In Genesis 2... the body was not so created as in Genesis 1:27. It was not created "out from nothing. " Instead, the body was molded and formed with elements of the earth. "Jatsar" Soil which had already been created "out from nothing" as found in Genesis One.