Don’t all Nazarenes believe anyone else is going to Hell?
And all Mormons believe all non-Mormons go to Hell?
And all Muslims believe all non-Muslims go to Hell?
Pretty much the only religion I know that believe that most people (excepting the most evil) has a place in the world-to-come is Judaism.
I’m curious why you’re singling out the Nazarenes? They’re fairly small, and I think they have the same theological beliefs as other churches derived from the Wesleyan movement.