Good question, but I guess it also goes down to what you think Jesus was. Do you think he was God Incarnate or had a divine nature? Do you think he was a prophet of God, but himself simply human? Or just a cool guy, but nothing divine? In the first case, you are a Christian, even if you don’t identify with any of the well known versions of Christianity. After all, many different conceptions of Christianity have existed.

In the third case, I don’t think there is or should be a term for it. After all, is there a word for someone who thinks Marcus Antoninus was a cool guy? If that’s not something that constitutes an important part of who you are and how you think, why should you be called anything in regards to it? Maybe depending on just how much you like him, we might call you a Jesus fan. Jesus fanboy or fangirl at worst. But there needsn’t be a specific word.

Now, the middle case, where you recognize Jesus as a prophet is an interesting one, because several religions would qualify, including Manichaeism, Islam and Druzism; and as far as I know there isn’t a term that englobes them all without also including Judaism… If I were to invent a term for that, I might go with “jesuic” or “yeshuaic”, by analogy with the word “abrahamic” that englobes those who recognize Abraham as a prophet.