Driven by Q-Anon and religion.
Does he have to enter a plea? This is all pure GQP propaganda involving QAnon crap that even takes in belief in "serpent people." How could anyone believe any of this and be deemed sane? My guess is that he will simply infest others with his insanity. If there is clear cut evidence that he did this maybe we could simply strap him in and convince him that he was going on a ride at Disneyland.
He is clearly insane, keep him locked up for the rest of his life in a secure mental institution.