See, I really disagree with that style of argument. Instead of taking Obama's word that his father was a polygamist who deserted him and his mother at the age of two, they instead try to make a retarded argument based on generalized statistics. Even if you assume the statistics are 100% accurate, there's no correlation between the two other than his father is Kenyan. How many Kenyans leave the country and go live in the United States?
How many Kenyans are the father of a leading Democratic primary candidate? Less than 1%, I'd wager.
Does that mean that Obama's father isn't his father? It's even more unlikely that a random Kenyan would be Obama's father than a random Kenyan being an atheist.
Does that mean Obama doesn't exist? It's even less likely that a random person in America would be a Democratic presidential candidate.