"Please see post #14."
I did. It says he's been a Christian for 13 years, and the linked item says he was claiming to be a Christian even as a child.
Evangelicals try to convert people to Christianity. Are you saying it's not possible to convert? Do you have evidence that Obama's conversion, if indeed he was ever Muslim, is not sincere? Since, as has been pointed out, conversion is very severely punished in Islam, doesn't that make his conversion that much more respectworthy?