Tommy's inability to recognize even basic references to his "religion" made me realize he's pulling an amateur tour guide schtick.
If you've ever lived in a resort town on the boundaries of the world, islands and so on, you're probably aware of the fake tour guide industry that pops up in these places. People running away from their old lives move somewhere tropical, realize there are no jobs, and discover that they can bamboolze tourists into buying drinks etc in exchange for a "local" showing them around. So you end up with this cottage industry of idiots leading tourists around and filling their heads with misinformation. It's illegal usually, but not often enforced.
The cleverer of these fake guides learn from copying other, more legitimate guides, and over time they memorize a series of monologues that wowed them or others in the past, and they lay these monologues on the tourists while acting very in-touch with the environment and so on, copying Native American speech patterns and movements (like animating their speech with body movements) in an attempt to look wise and knowledgable.
Tommy is like this. He has no idea what Anonymous does, but he threatens with them. He doesn't know anything about the Marines, but he was positive Coll was legit and behaved like she was. He had no idea what "esoteric" meant, but he was positive his beliefs weren't esoteric (esoteric loosely means oral tradition "healers" and so on, which he often claims to be).
He has no real depth of knowledge. He only has lines of convincing bullshit that he heard some other (smarter) hippy say. This is why he's confident he can trick psychologists: he has some series of statements he makes, body language, etc to appear harmless.
Tommy is an actor. Even he probably doesn't know who the real Tommy is anymore, because that part of him, the childlike, honest part of him that he champions in word but not in action, is being repressed by his own homophobia and God knows what else.
We casually throw the term "sociopath" around here a lot, but, in all seriousness, if you asked me to sum him up in one word, that is the word I would use. An unsuccessful-at-grifting, male Zoe Quinn.
