Religion as a mental disease
Religion is a mental illness. It makes all kinds of unverifiable claims based on not evidence, but wishful thinking, it makes the most absurd and arbitrary demands of its followers, and threatens ludicrous punishment if those demands are not followed, and shows utter contempt for rational thinking and a never ending urge to impose itself not only on believers, but also onto nonbelievers.
Just because a delusion is a mass delusion doesn't make it any less of a mental illness.