http://www.youtube.com/watch?v=nMhB-CwF4yc
This is not a "slip" or a "gaffe". It is not out of context. It is a simple declarative statement that rolled off his tongue as easy as "you didn't build that".
Look at the man's words and deeds. He is who he is.
It depends what you mean by muslim. My take is that he a marxist first and then somewhat of a cultural muslim second. By cultural muslim I mean he identifies with muslims and supports them but has no interest in being a devout or even practicing muslim. He needs no God. He IS a God in his own eyes.