No, I consider him Christian because he was born a Christian, raised as a Christian, and considers himself a Christian. Were I to suggest otherwise I’d be spitting in the face of most Christians, those who don’t believe in a Jewish racial taint. Which I think is the majority.
His mother may have taken him to Episcopal church as a child, but I am not aware of any evidence that you can use to show he is a Christian.
You might call it a ‘racial taint’ but the Law of Return either applies, or it doesn’t. And it applies to this gentleman. If he is Jewish enough for Israel, he’s Jewish enough for me.