According to Christian theology (based on the New Testament), Jesus is the Son of God and God in the flesh (the Incarnation). This is a central belief of Christianity, often understood through the doctrine of the Trinity.

The doctrine of the Trinity teaches that there is one God who eternally exists as three distinct persons: the Father, the Son (Jesus Christ), and the Holy Spirit. They are co-equal and co-eternal.

The Bible does not name Cain's wife. Based on the Genesis narrative, she must have been a descendant of Adam and Eve (a sister or niece) as they were the first and only human couple on earth at that time. Intermarriage was necessary for humanity to populate the earth.