An unwitting infidel.

The teacher of the confused answers your question and the attainment of the lost that many and good have realized God, and so on (Chapter 16, Chapter 6)
‘ And if it occurs to you that one should teach merit to believers in the realizations, because he was educated in this way, or because of his foolishness and shortsightedness, then you should have the same opinion about the worshiper of idols, because he does not worship except because of foolishness or education, the custom of their ancestors in their hands. And if you say that the simple scriptures are filled with these distortions, then you will know that the worshiper of idols was not brought to worship it by imaginations and bad concepts. It is found that there is no excuse for one who does not trust the true scholars if he was short of intellectual ability. And I do not consider a disbeliever to be one for whom the negation of the fulfillments has not been proven, but I consider a disbeliever to be one who does not determine in his mind its negation, especially in light of the translation of Ankalos and the translation of Yonatan ben Uziel, peace be upon them, which have distanced the fulfillments from the purpose of the distance’

So that it is very difficult to teach merit about them.

The world has a habit of letting things go in one ear and out the other.

It is easy to teach them a right, but it does not concern the question of whether to pray with them.

And when I think about it, the Chabadniks are quite reminiscent of the story of that fool who thought he was the Messiah in the Responsorial Psalms of Moses (Abe'a K.K.) that Rabbi Moshe Feinstein qualified to grant a divorce (taken from Nadav Shnerb's "Keren Zvit"). His reasoning was that since that fool keeps it a secret and behaves normally, this thought does not stem from an epistemic flaw but from a moral flaw (pride). In practice, the Chabadniks - if they believe in these beliefs - keep it a secret, and therefore the argument of the Letters of Moses is valid for them.

As I wrote above, the discussion is not about whether they have knowledge, nor whether they are guilty (rapists, mistaken, or mischievous). The question is whether they believe in God, and the answer is no. They are in partnership + fulfillment.

In my opinion, in most cases they can be included in the minyan. This is because the 13 pillars of faith have been accepted by most of the Jewish people, and they have a higher status. When a Chabadnik or a Braslovar says that the Rebbe is God or something like that, he doesn't really mean what he says, he usually expresses strong feelings of attachment to the Tzadik, etc., but if you ask him, "Do you intend by your words to contradict the 13 pillars of faith? If it turns out that your words about the divinity of the Tzadik contradict them, will you retract them?" They will usually answer that the 13 pillars have a higher status, and that the teachings of their rabbis and their beliefs should be interpreted according to them.
That is, ultimately the Chabadniks and the Breslevers place the Three Barrens as the supreme principles by which Hasidism must be interpreted. Therefore, they are considered Jews who believe in the uniqueness of God.