I don't gather from the article that he " denied" christ. I read he said he was an Arab, and showed his friend's copy of the Koran. He did not blaspheme God or Jesus. He also LIVED to tell his tale to the world. There ain't nothing wrong with that, folks.
I am pretty sure, God will forgive him.
Given the situation, Lots of folks would have lied.
Or of course, you could just let the enemy have their way with you and not be around to fight another day. I'd sure rather have a living Arab Christian here helping out than another martyr. Had he not deceived the enemy, he'd just have been another statistic in the body count, and no one would have known his story at all -- or even have the 1st person testimony that the terrorists were specifically looking to kill Christians. That's very useful first hand knowledge to trumpet around the world. Enough of these and maybe even the Europeans and American Democrats might take notice (well, that's probably a stretch). Martyrs are no good at all in helping with the fight at hand.
I haven't had a chance to read the whole thread, so forgive me if this has already been mentioned but we may have to give kudos to the guy's muslim friend. This muslim may very well have known that his colleague was indeed a Christian, but kept quiet about it to spare his friend's life. Just a thought.