A theist can only know God only when he has become cleansed of the impurities of mind and its outward going faculties through the senses,
What, specifically, are these "impurities of mind and its outward going faculties" that need to be cleansed? What, specifically, are the steps required to cleanse them? How do you test the resulting "purity" level so that you know you're ready to proceed to the next step? If you're going to claim that you have a method--and not just a few lines of deepity-laden balderdash--then you should know, in terms specific enough for others to apply, what you are talking about. "First the Alchemist must draw forth the carbones from the Red Stone of Life in order to transmute it into the White Stone of Purity..." is not a statement of method until all of the relevant terms are coherently defined.
When he does this he can say "The Father and I are one".
Does "he" have any way to demonstrate that this is, in fact, the case? The world is full of "spiritual Masters" of various sorts who teach different things. The quote you use is from "Jesus" as portrayed in the Gospel of John. The teachings of this "Jesus" disagree with the teachings of the great spiritual Masters who designed the Pyramids and the Temples of Karnak and Luxor, with the ones who penned the Vedas and the Upanishads, with the ones who built the monasteries of Tibet, and so on.
Since you're talking about "method," you should have specific, repeatable steps to test people who claim to be "spiritual Masters" with messages from the divine (however defined). Specific. Repeatable. Steps. That's what "method" is.
He can now teach what he knows of the limitations of the senses the mind and the body. They are teachers of peace and human unity.
"I came not to bring peace, but a sword." Whelp. So much for your guy Jesus. Got any other ones you'd like to propose?
The human being according to Theists have become depleted of Divine Love. The theists are teaching their faithful and truthful students how to get back to that state of being.
Everyone's mind is different and is engaged in some activity that lowers ones conscious awareness and they becomes inhumane, selfish, egotistical, Lustful, Greedy, angry etc etc etc. The number of states of mind is immense - theists are addressing the various states of mind of their disciples and bringing them round to the state of love. Lets not do the balderdash that assumes one method applies to all.
That method varies from individual to individual depending on the severity of the problem of mind that prevents one from knowing. When the teacher is aware of this problem through your confession he gives a soloution based on many things of environment, society, food, etc etc. to solve that problem.
The chemistry, the mental make up, the physical environment and the surroundings they all play a part and it is that which he addresses in his disciples.
A teacher can teach you what to do but you have to walk the path to know the truth. First one needs to know what the problem is in themselves. And then follow the instructions the teacher gives.
The student or disciple knows what they have going on their minds and what the intent is with these mental issues - in order to know God the theist offers them the solution "to thine own self be true" and that there is no judgement with him only solutions - they confess this truth of their negative mind they take the solution act on it and solve this recurring problem of mind ---- if not they choose to settle into its negative agenda.
Did Jesus use a sword on anyone?