“retells the biblical story of Genesis with gay characters.......it’s offensive to Christians.”
Not only is it offensive to Christians, but it is also offensive to logic. How would “gay” Adam and Eve populate the earth? Just how would a “gay” family exit the ark and repopulate the earth?
As I remember Genesis, it revolves around the creation of the earth and the population/repopulation of the earth. That is NOT POSSIBLE to accomplish with gay behaviour.
If you can accept the population bottlenecks and incest necessary with the literal bible stories, you can accept gay people having kids somehow.