I will go back 2,000,000 bc with my 10,000 wifes and private army. I repopulate earth with my descendants. I will change history. 
Oh.. please no. The earth can't afford a billion inbred people with genetic disorders. You better pack off to some other planet (Mars, may be. Neptune is also another option) with your descendants.
Seriously those Israelites came from one family right? Are those jews inbred?
I always wondered as a kid, if the bible story is that adam and eve were the first two humans, aren't all people inbred? Then someone told me "oh no you see after they get kicked out of eden they go to this town and there are thousands of people there." Oh, okay because that's not a major plot hole or anything...
Then after all people was killed in the flood except noah's family.