No he is not Moslem but his first name is Arabic and I believe his father was a Muslim. Presently, Obama is a Christian.
His father was an African Muslim but abandoned the family and I don't think had much if anything to do with him. His mother (who brought him up) was an American Protestant, I think of Scandinavian or German extraction. When he first entered politics, I recall that it was said or implied that he was Christian, but lately, he's pretty cagey about what he is. He likes to go in for the big Dem generalities (mushy words about "faith," etc.) that prevent you from really knowing anything about him.