I'm sure this has been asked a thousand times before...?

the sons married sisters, neices, and cousins at the first then second cousins, etc.

The Book of Genesis, written by Abraham was presented in parables. For example, the earth and all things were created in seven days. There was no calendar in the beginning, so what did one day equal? Genesis was written with the knowledge of words of the Prophet Abraham's time. Adam and Eve were accounted for, being first man and first woman, and they had more than two sons. Cain and Abel were accounted due to the murder of one and the punishment of the other. What about brother Benjamin? Why was he accounted for in Genesis? I would imagine, though not documented, that incest wasn't an issue then since the goal was to be "fruitful and multiply". The bottom line is this. Build your faith in knowing that the world as we know it was created by someone greater than us. If we had all the answers, why go through the trial of life, to prove ourselves worthy to be back in His presence? A person must ponder the things seen and unseen, great and small, and rather than ask why, bend your head and pray about it. Study your scriptures. The answers are in there. Build your faith that there is Someone greater than man.

When the story is taken literally, people assume that Adam and Eve must have also had daughters who just weren't mentioned.

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Genesis 5:4 shows they gave birth to many sons and daughters.

if related people get hot with eachother and have kids, their kids will turn out demented or mentally retarded. Science proves us to be the demented figure of adam and eve wow.

Obviously it didn't happen. Its just a story. It doesn't have to make sense. It's like asking how Jack's been stalk grew so quickly.

Cain just got a wife from out of nowhere everyone knows that!

i thought adam and eve had daughters too; they just didn't record it in the Bible.

incest

yet Christianity condemns the practice...

maybe because it's all a sham...