This Bible contradiction is from the Skeptic's Annotated Bible.
Yes, everyone is descended from Adam and Eve.
Genesis 3:20 View context
And Adam called his wife's name Eve; because she was the mother of all living.
Some are not.
Hebrews 7:3 View context
Without father, without mother, without descent, having neither beginning of days, nor end of life; but made like unto the Son of God; abideth a priest continually.