"If that's true, then you must believe that all humans descended from Adam and Eve, as that is what scripture clearly says."
No scripture does not say this, some man or religion makes this claim because they are unlearned in what is actually written in the original language. But hey Christ did say that it is not given for all to understand that is their protection. Sadly though this claim that all peoples come from two adult human being is one of the main reasons why we tax payers are required to have evolution taught to our young children in public education. DNA backs up what the Bible says.
No scripture does not say thisGenesis 3:20 "And Adam called his wife's name Eve; because she was the mother of all living."
Oh, and here's another scripture you might find interesting.
1 Corinthians 15:45 "And so it is written, The first man Adam was made a living soul; the last Adam was made a quickening spirit."
So tell me, do you think these verses say something other than what they plainly say? And if you do, on what scriptural basis do you make that claim? (I mean, other than your opinion that God made man two different times.)