"Adam and Eve sons and daughter married each other to keep the earth populated with mankind."
I reckon it wasn't due to 'sin' that God caused the 'Global Flood' (in b4 the ancient Egyptians, Chinese et al). Why? Because afterwards...
Noah, wife, their three sons & their wives...:
image
...yep. You right-wing fundies today certainly represent the apex of Biblical Creational and genetic perfection, yessiree! [/hyper-sarcasm] And aren't we humans supposed to be the ultimate in your 'God's creational genius?! Nope, in the 'inspiring' of the Bronze Age goatfuckers who had ideas above their stations, he certainly told them to take into account, when writing his 'flawless, perfect Word', the industrial-strength inbreeding that went on as a result of such an ultra-limited gene pool, yessiree! [/mega-sarcasm]
To use an analogy - as per 'Intelligent Design' - God is the 'Great Architect'. In the case of we humans, why did he put the Leisure Centre so close to the Sewage Outflow, then?! [/hyper-smartarse]
Moral: As per the above pic - and your 'claim', how(inc)est2008 - if we are made in your 'God's image, then he himself proves what an inferior subhuman he is, therefore proving that we evolved Atheists are more than infinitely superior to him, and not just for listening to all that Biblical Creation bullshit in the first place.