Thank you for the question. I do not think God created any other humans besides Adam and Eve. In Genesis 4:14, Cain complains about his punishment and being a vagabond and worries about being killed by someone who finds him. Here many ask, well, who is there in the world to kill him if Cain and Abel were the first sons of Adam and Eve? Three verses later, Cain meets his wife, has children, constructs a city, and names it after his son Enoch. It takes human resources to construct a city, so obviously, there must have been people to assist in construction. In verse 25, Eve has another son, and they called his name Seth. In chapter 5:3, it reads Adam was 130 years old when he fathered Seth. Likely, Cain and Abel were not the first children of Adam and Eve. They likely had many children before Cain and Abel spread out and multiplied with children of their own. Also, in chapter 4:17, Lamech, the great great grandchild of Enoch the son of Cain, had two wives. It was common in those days for men to have multiple wives and many children. With all things considered, there were many children from Adam and Eve who had much offspring before Adam and Eve. The alternative explanation of other humans created around the world in addition to Cain and Abel presents several theological problems.
Descendants of Grace Monergistic Agora 