carm and it's related forum rate Orthodox and Roman Catholics as religions separate from Christianity along with Buddhism, JWs, Freemasonery, Islam, New Age, etc. They list as heterodox Seventh Day Adventists, Church of Christ, Word of Faith. And as ORTHODOX: Baptist, Calvary Chapel, Home Fellowships, Lutheran, Methodist, Presbyterian, and Non-Denominational...
Come on, friend...What do you expect from folks like that?
Invite them HERE.