[Jedd]

Absolutely. If we agree that everyone believes in either 0 or 1 religion, then we'd agree that everyone disbelieves in n or (n-1) religions, where n is several thousand (depending how you slice and dice the various sects and cults).

I'm not sure what the vast majority practice, though Pew [1] has done some good research on beliefs amongst the second most popular religion. Attitudes towards the execution of apostates is especially interesting reading.

In any case, if you live in almost any of the countries listed in that section you'll definitely be happier (and probably healthier / less likely to die) if you're religious than if you're not.

https://www.pewforum.org/2013/04/30/the-worlds-muslims-relig...