Does he have to be either? - you ask. And the answer is, in principle, of course not.
But in practice Jordan Peterson is indeed being treated as if a saviour, or potentially such; therefore - since he is nothing of the kind! - in practice JP is indeed an antichrist.. and such by a precise definition of being a person who rhetorically uses aspects of a Christianity he disbelieves and opposes to deny Christ; someone who advertises to superficially-Christian agenda but who is fundamentally pursuing an un-Christian agenda.
(An antichrist is not supposed to be explicity against Christ - as some people mistakenly imagine; an antichrist is someone who seems a Christian or Christian supporter; who might indeed appear 99% Christian - but the missing percent is their real agenda. Because the Antichrist is a deceiver, in-practice. Whether an antichrist is a purposive deceiver, or has deceived himself before he deceives other people, is not a crucial distinction - an antichrist can do his evil work even if he is unaware of his own true motivations; and perhaps more effectively. For example: antichrists abound among 'Liberal Christian' church leaders - who may speak 99% Christian-talk, but whose real agenda is an aspect of Leftist materialsm, such as progressing the sexual revolution.)
But is Jordan Peterson really being treated as a saviour? Well, yes! Obviously!
Now of course anyone who - in their hearts - is regarding JP as a saviour may deny it to themselves or others; but my personal experience over the past year or so has been to have an unprecedented number of individuals write to me to recommend Jordan Peterson.
It was not just the fact of them having written to inform and enlist me; it was the starry eyed enthusiasm of their advocacy that was so striking. The tone was that 'Here, at last!" was someone to inspire faith and hope, someone to get-behind... (CoughAntichristCough)
By unprecedented, I mean that this has never happened before with any other person, nothing like it; yet these letters were frequent enough that I at first assumed that there was an organised campaign, or that they all emanated from a single besotted 'troll'... however, it became apparent that there was indeed a 'movement' who regarded JP as their personal saviour and the world's potential saviour.
Am I sure that Jordan Peterson is not a saviour? Yes! Of course he isn't! He lacks the 'one thing needful' - which is to be a Christian; and the other linked needful, which is to advocate a non-materialist, a transcendental metaphysics that acknowledges the objective reality of the spiritual.
What Peterson advocates is merely a moderately libertarian variant of modern, mainstream, Leftism - and those who can't see that fact at a glance are merely revealing their own unconscious complicity in the assumptions of secular, hedonic/ utilitarian materialism.
To base a world-view, a morality in (this-worldly) psychology just-is Leftism; and the disagreements and differences among Leftists are merely quibbling over the most effective means to that end.
This is a plain fact of categorisation: Peterson is a Leftist and a materialist - and there is absolutely no way in which yet-another Leftist materialist is going to awaken, inspire or lead anybody in the direction they need to be going... except, perhaps, in seeing-through and understanding the deception being practiced, and reacting-against JP.
In principle, of course, one can read/ watch/ listen to JP for what he is worth - just as we do with any other non-Christian materialist. I personally have read a great deal of Jung and his disciples and followers, and there is certainly value in it.
Yet this is not what is needed. No psychology addresses what is fundamentally wrong in us, or in modern society. And if we overvalue any kind of psychology as an aim in life, it will block what is needed. Sometimes a half-correct, semi-satisfying, moderately-useful answer becomes a trap that does more harm to us than an answer that is more-obviously inadequate and impels us to continue seeking the truth.
However, if/ because/ when circumstances force us to make a choice between embracing Jordan Peterson as saviour or rejecting him as antichrist; well, the answer is a no-brainer.