I have just started studying the Book of Genesis and I am having a hard time understanding the family lineage. It seems that after God destroyed all living creatures with Noah, that the credibility of the story is lacking. First of all, if God did destroy all living creatures than how can Noah’s sons multiply unless it was with interfamily. What constitutes incest? It seems like there is a lot of intermarriaging with cousins. If God didn’t destroy all living creatures and there were people left, why does the Bible say differently?
Also, with the men having many different wives and it is ok with God. Where in the Bible does it say that it is not ok to have multiple wives?
Also, why did God want disharmony with the people at Babbel when he dispersed the people and language? It seems that this is the reason for all the brothers and family to be against each other?