Obama has never been a Muslim. He is a practicing Christian. You are repeating an urban legend. It has even been debunked at Snopes.com.
http://www.snopes.com/politics/obama/muslim.asp
In this case it doesn’t matter what snopes say. Obama’s father was a Muslum; therefore he is a Muslum.
Besides, Snopes didn’t say his father wasn’t a Muslim. What they said he wasn’t a radical Muslim or practicing Muslim.
Even though Obama has never said he was or wasn’t a Muslim; only his handlers have said he was a Muslim. If your father is a Muslim; you are a Muslim.
Pretty good trick of PR and Snopes reported only that Obama was not a radical Muslim.