Following the Path isn't really "converting" to a new faith, it's changing the way you live your own faith. Being a Pathist doesn't mean abandoning the gods that your fathers worshiped.
Being a Pathist simply means understanding that that worship has a deeper reason than appeasing the gods. Worship binds us more deeply not only to our gods but to each other, and to the powers that will help us break free of the shackles of this world and reach our highest potential.
Is that what you seek? Not a new set of routines and rituals but a truly new way of viewing yourself and the world around you? That is what we offer.
I'm pretty sure that at least one of my world's religions would believe in such a being (god of atheism). Not the actual atheists though.
Pathism spread as rapidly as it did because it doesn't require new adherents to give up their old gods or religious rituals. It only requires them to view these gods and rituals in a new philosophical context. Over time, of course, any given "cult" will see its members turn away from the old ways and become more and more like every other Pathist, but it's a gradual process.
And Pathism has thousands of variants, split on not one but two spectra - which god one worships, and which school of theology one adopts. Naturally, the greatest conflict is between those who differ slightly in the latter. But its rare for it to reach the point of bloodshed, at least without some other underlying cause.
Pathists basically view outsiders as misguided and incorrect, but it's not the end of the world since they believe in reincarnation, so nonbelievers will end up as believers in a lifecycle or two.