Saying that anyone who disagrees with you isn’t a Christian is a real conversation-stopper. Do you really want to do that?
More briefly than possible, I’d say. You just can’t go around saying that a Christian must be an IDer or creationist (not sure which you intended).
Universal common ancestry, I believe. How he thinks ID works within that framework has never been clearly stated.
Some lens crystallins in various taxa (birds among them) would be another example. Some of them also function (presumably their original functions) as enzymes elsewhere in the body.