There is a big difference between embracing Christian ideals and
being a Christian. A Christian is a follower of Christ, one who believes that Jesus is the Son of God and the Savior of the world. Many non-believers follow his teachings, but stop short of believing in his deity. This man is not a Christian.
I have no problem with this man being in church, but I'm puzzled as to why this congregation would accept him for membership knowing that A) he's not a believer and B) he's doing this to make a political statement.