In Christendom there are groups who find themselves exclusive, believing they are the holders of the absolute truth, while all others are heretics or even the work of the devil himself.
The secular faithful believe that multiple wills shape our reality, but this time it’s not the wills of various gods. It’s the wills of various individuals, based on what they want, what they think is morally desirable, or whatever seems compassionate at the moment in a specific case. They make universal law based on idiosyncratic circumstance. Throughout history we find lots of great minds who throughout their life did everything to get people way from God trying to let them believe that god did not exist, but they themselves got a funeral in one of the main churches from Christendom, as to say to the world "you may now not believe any more in god, but I shall try to get an other life by letting myself buried the Christian way."