2005. 13 years ago. In a more recent interview he said he was a Christian.
In 2005, this nation was still terribly uninformed about Islam and many people engaged in wishful thinking that it is a peaceful religion, but by now the truth has seeped out. Let's hope he has arrived at a better understanding.
I give him credit for appearing in a Christian movie and for testifying in his song, given that Christian views are career-killers in Hollywood. If his is the "big name" that draws more people into this movie or encourages other "name" actors to come out of the believer closet in Hollywood, it's all to the good. None of us is born a fully-formed Christian.