The thinking hurts sooo much... a friend of mine who is of Korean descent asked me why I would possibly believe that in just 5 or 6 thousand years one guys family could produce 7 billion people so fast? I was like man... anything is possible with GOD. But when you try to do the Math and realize its kind of hard to fathom what that must have been like it really brings you back to reality
Here's a population calculator: http://www.metamorphosisalpha.com/ias/population.php
(check the Show Subtotals box and it shows you the population for each year also)
If you start with a population of two people and set it at 6000 years with a growth rate of 0.012, it says the population will be:
Population in 6000 = 2,392,899,758,362,400,000,000,000,000,000
lol