non-christian
To not be Christian.
"you are non-christian" said Dequan to Debby.
non-denominational Christian
A Christian (i.e., follower of Jesus Christ who accepts the guy as Savior), but is not affiliate with any particular denomination or group; sometimes it may also refer to a Christian group that claims to be non-denominational, or a member of such a group.
I accept Jesus as Savior, but am not Catholic, Protestant, Orthodox etc., nor anything else. I'm a non-denominational Christian.
non-denominational christian
a christian person who is wimpy and can't choose a real religion. A person who is netutral on religious beliefs.
being a non-denominational christian i believe that other religions are wrong but mine.