Gamma World: The Infinity Arc
These are worshipers of a radiation god which they reverently call the “Radiant Divine Glory”. These cultists are those with high radiation resistance and many are mutated, as initiation requires that they spend a week in a radioactive area. Radioactivists are often seen traveling the desolate areas of the world, searching for new “holy lands”.
Their symbol is the radiation hazard symbol. Traditionalists seek out holy sites (radioactive area), while extremists what to bath the world in radioactive fallout!