We believe that we all came from one man (Adam peace be with him) and mate (Quran) or Eve one woman (Bible).
We also believe that Allah messages from Adam p.b.w.h. to Muhammad p.b.w.h. have always been the same as a guidance and reminder to mankind.
Therefore, if Adam p.b.w.h. and mate or Eve p.b.w.h. was one man and one woman, what roll does incest plays in the message of Allah?
Also the Quran said that some of its verses are allegorical and some are metaphorical for "every man He has created a mate". Is this verse actually a metaphorical verse where it refers to many men and many women all over the earth?