Let's go back to the beginning — all the way to Adam and Eve, and to the question: Did they exist, and did all of humanity descend from that single pair?
According to the Bible (Genesis 2:7), this is how humanity began: "The Lord God formed man of the dust of the ground, and breathed into his nostrils the breath of life; and man became a living soul." God then called the man Adam, and later created Eve from Adam's rib.