It's not a matter of what he was taught. I agree, it may have been innocuous -- whatever. What matters is that if he was Muslim, and now proclaims to be Christian, as such a prolific figure as President of the United States, he becomes the poster boy for Islamic apostacy. Any number of nutball clerics would issues fatwas against him, which would not only endanger him, but given the desire to use WMD, everyone else in Washington D.C. The risk is already there today for whoever's president - I understand that. But these Islamofascists have a very special hatred for turncoats, and that includes anyone who converts out of Islam. Maybe I'm flat out wrong about this, but it seems to put him between "Barack" and a hard place.
You are right and it's particularly true because Islam is decentralized. Any imam or mullah can issue a fatwa and somebody will follow it.
Salman Rushdie had it easy.
I suppose it isn't a sufficient reason to oppose Obama if he were a good candidate, but it does underscore the fact that he has zero experience. The Muslim world hasn't heard of him.
I don't think Obama is particularly Christian. He doesn't even attend church. Frankly, I think Muslims would consider him winning the nomination as a coup d'etat.