Not really - contrary to what some people believe (or wish), you don't need to be mentally ill to be fundie, let alone religious.
In fact, a lot of neurodivergent people I know are fairly reasonable, and a lot of unreasonable people out there are neurotypical. There's no correlation.
Believing that "everyone who agrees with me is sane, everyone who disagrees with me is insane" is logically flawed and creates a false sense of superiority, which is actually a particularly fundie trait.
Besides, isn't it more entertaining when you realize people willfully chose to believe in gobbledygook?