An individual who is diametrically opposite to the basic foundational teachings of Jesus the founder of the Christian faith. In essence they are a total hypocrite in all aspects of what it means to be a Christian.
Peter: Did you know that church is so hypochristian! They think they have the right to tell others how to live.
John: Isn't that like saying to God, "Hey you aren't doing your job right! I know what's best here"
Peter: Maybe it's an innate desire to be their own autonomous being. A feeble attempt to be their own god.