@latein @ArdainianRight @hachi @djsumdog @meowski @mrsaturday Many groups with various beliefs and teachings popped up in the first few generations after Christ with their own interpretations on His message. The most prolific group call themselves "Christians". You can't be in the club if you don't follow the rules.
>Gnostics are also Christian.
If that were true, the term "Gnostic" wouldn't exist. To prooftext a bit, James 2:19
>You believe that there is one God. You do well. Even the demons believe—and tremble!
It is not enough to pick and choose what to believe, within reason of acceptable heterodoxy*. Christian has a meaning, and I'm fine going with essentialism for this discussion.

*YOU do not get to decide what is heterodoxy and what is heresy. People have devoted and even given their lives in defense of their positions on this, and we have a working definition for mere Christianity today. Arianism is not Christian.