No, I don't believe his silly claim, nor do I beleive that Obama is a Muslim terrorist, nor any of the other ridiculous claims that have been made and circulated over the internet.
I believe that the significant differences between Obama and McCain are:
McCain favors making the tax cuts permanent. Obama doesn't.
McCain favors keeping a force in Iraq long after the hostilities have ended. Obama wants to bring them home ASAP.
Obama favors a universal medical care plan for the US. McCain doesn't.
McCain has experience on his side, while Obama has youth.
I believe we should take a look at the real differences, and quit trying to make outlandish claims about either of them.