A handful of findings about belief that have stuck with me, because they're a little uncomfortable.
The placebo effect is rock solid: if you believe a pill will dull your pain, your brain releases endorphins that actually do it — even when the pill is saline. The same shows up for prayer. But here's the catch that gives it away: secretly give someone a placebo, or pray for someone who doesn't know it, and the effect vanishes. And the more skeptical you are, the weaker it gets. The belief is doing the work, not the pill — which means belief itself has a real, measurable, evolutionarily useful payoff.
There's even a genetic thread. A gene called VMAT2, which helps regulate monoamines like serotonin and dopamine, correlates with greater spirituality. If belief reliably triggers the brain's own endorphins, that may be part of why religious people, statistically, tend to live somewhat longer and report being happier. The belief needn't be true to be good for you.
The flip side is how easily belief manufactures patterns. Two friends are walking and one says, "I was just thinking about Joe" — "me too, we must be psychic!" The likelier explanation is that both of them subconsciously caught the same cue, a passing face or a song, that pointed at Joe. The tendency to fuse those signals is called transliminality, and it's well documented. People prone to it are better at spotting faint patterns — which is exactly why they conjure more false ones too. The skeptic makes the opposite error: too quick to dismiss, they miss patterns that are really there. Neither setting is free. You're always trading one kind of mistake for the other.