Did God only create Adam and Eve ? Does that mean we are all descendants of Adam and Eve, and if so are we all related ?
"So God created man in His own image; in the image of God He created him; male and female He created them. Then God blessed them, and God said to them, 'Be fruitful and multiply; fill the earth ...'" (Genesis 1:27-28). God created two beings, a male and a female. From these two was the earth filled. Genesis 2 gives the details of that creation. "And 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 being. ... And the LORD God caused a deep sleep to fall on Adam, and he slept; and He took one of his ribs, and closed up the flesh in its place. Then the rib which the LORD God had taken from man He made into a woman, and He brought her to the man. And Adam said: "This is now bone of my bones and flesh of my flesh; she shall be called Woman, because she was taken out of Man."" (Genesis 2:7, 21-23). We preserve this in our language to this day. Both the words "woman" and "female" means "from man."
Paul told the Athenians, "And He has made from one blood every nation of men to dwell on all the face of the earth" (Acts 17:26). So, yes, we are all related. Eve was formed from the rib of Adam (Genesis 2:21-22), so we are literally all descend from one blood, which is Adam. The notion of race doesn't exist in the Bible; instead it speaks of nationalities which is much more accurate. This is why any human male can produce children with any human female, we are all of one family.
Further, we all descend from Noah because only Noah, his wife, his sons, and their wives where saved from the flood (Genesis 6-8). Thus all males share DNA from Noah.