Final answer:
According to the Gospel of Luke, Jesus became a son of Adam because he was seen as the second Adam and Mary as the second Eve. Jesus' sacrifice on the cross made it possible for humans to have eternal life in heaven.
Step-by-step explanation:
According to the Gospel of Luke, Jesus became a son of Adam because he was seen as the second Adam and Mary as the second Eve. Just as Adam and Eve caused original sin and were expelled from paradise, Jesus and Mary made it possible for humans to have eternal life in heaven through Jesus' sacrifice on the cross. This is a concept in Christian theology where Jesus is seen as the one who brings salvation and offers the possibility of eternal life to humanity.