Paranoid schizophrenia is when there is a presence of a delusion, a false belief, and possibly a hallucination that fuels that delusion. Types of delusion include delusional jealousy, erotomanic delusion, persecutory delusion, grandiose, and somatic delusion.

delusion

It is certainly a delusion; but the propensity of some religious followers to try and extend that delusion shows that it applies to more than just the self. Also MASS delusion.

Dawkins, Richard wrote The God Delusion.