I'm more so asking for a clarification here, because it seems there is some vagueness in what is or is not a Christian. This may be off topic, if so, just let me know, lol.
I would guess that a Christian would be defined as anyone who follows the teachings of Jesus and/or follows the doctrines of Paul about the divinity of Jesus. This would include the Ebionites, sometimes called "the Jewish Christians" who deeply influenced Islam's beliefs on Jesus (Isa), and is, as far as modern scholarship can tell, the closest belief-system to the actually beliefs and doctrines of Jesus and His disciples (see Tabor's or Ehrman's or many others work). It would also include the followers of Arius (Arianism) who taught that Jesus was separate from the Father (based on John 14: 28 - "The Father is greater than I"), sects that believe Jesus is only human like the Socianists (which, I have heard would include the modern day Unitarians and Jehovah's Witnesses), and those that believe Jesus was a wholly spiritual being (like some Gnostic sects, and docetists). But it would also include all miaphysite, monophysite, dyophysite, modalist, unitarian, trinitarian, ascetic, adoptionist, Orthodox, Catholic, manichaean, and gnostic, as well as personal, understandings of Jesus. Most of these groups have been labelled "heresies" throughout the ages and are still strongly debated.
I bring this up, mainly, because I would be curious as to how one would classify Theosophists, the various magical societies, especially the Ascended Masters oriented ones, and other such occult and esoteric groups. Most of those groups, at least most of the people from those groups I've met or come across, do not "self-identify" as Christian, but they still make use of Christ and/or Jesus as an object of reverence, aspiration, and even worship. This would also include Voodoo, Voudun, Hoodoo, Candomble and the orisha religions, like Yoruba, which have been heavily influenced by Catholicism and often times are syncretic versions of Christianity and African- or Afro-Caribbean- religions or Mexica religion based syncretic belief systems. How would these be classified? Many of the people that practice these systems worship Jesus, and especially Mary the Mother of Jesus, as Holy and/or Divine beings. However, most of the belief systems could not be remotely described as monotheistic (maybe henotheistic), and is quite a grey-zone, I would think. Plenty of these people, at least the ones I have met or come across, DO self-identify as Christians, at least in public. Also, some Japanese shrines have images of Jesus within them. I'm not sure if they are Buddhist or Shinto, but my friend from Japan sent me a picture of one because he was astonished by this, lol. Also, within Hinduism, considering Jesus as an avatar of Vishnu (or another aspect of God) would be acceptable to most forms of Hinduism. Even some Buddhists consider Jesus as a buddha (see Thich Nhat Hanh's work on the subject, like Going Home, Living Buddha, Living Christ, or others), even though most forms of their religion are agnostic.
So, can one by a polytheistic Christian? This sounds like a contradiction of terms to me. Or an agnostic Christian? So while I do whole-heartedly agree "Is X Christian?" or similar questions are in bad taste, I would personally like some clarification as to the scope of possible questions. Like, would asking, "What are the Voodoo understandings of Jesus?" or "Would Hinduism consider Jesus the Son of God?" be appropriate for this site?
I'm sorry this was so long, I was just looking for clarification and didn't quite find it appropriate for its own question. If you guys think it should be removed, I will happily. I would have just asked it in a comment if I wasn't such a verbose fool, lol. Thank you for your responses!
Edit Upon consideration, I'm thinking this may be best as a separate question, but I will leave it up until someone tells me to remove and/or move it.