Several of you have mentioned the cult aspect. As some one who is pretty well versed in different camps within the Christian faith, it is my opinion that his local faith groups weren't the types that usually lead to this sort of extremism.
Often it's ultra conservative, right wing extremists who might be prone to living in seclusion, believing they're the only ones who can hear God, or a specific stream of Mormonism (not all) that believe in taking child brides.
However, Tad's churches--imho--are non-denominational ones that appear pretty moderate. They had rock music, encouraged humanitarianism, and so forth. I recognized some of the influencers he quoted from the faith and many of them would be neutral enough that a lot of us would look at them as inspirational. The people involved in the churches also seemed like mainstream middle class people most of us would view as normal (as opposed to more radicalized religious people who dress or behave differently).
And Tad himself seemed like he drew from all camps. He has countless quotes from motivational gurus and other religious sources that would be considered more aligned to Buddhist philosophies. He had a few political posts that swing a bit Democrat, even though he seemed to be voting for Trump.
I think Tad was fighting demons in himself and eventually started rationalizing behavior he knew was wrong. I think the delusions he holds now--that he can start a new life--are the product of his own psychology not one that was groomed by radicals.
This is my opinion based on what I have seen and read now. If anyone notices a connection to a very extreme religious group in his networks, that I missed, I would love to take another look and re-evaluate.
Without giving too much detail, I have worked with victims of religious abuse many times. While it's always a valid thought pattern to suspect this, my own opinion is that he doesn't have help, but that if he does, it's not help from a religious cult.
I think many things in Tad's situation and social media feeds would disqualify and ostracize him from cult members.
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