People can believe wrong things by the millions (Yay! the Earth is flat), that does not make it right. Stupid people can believe correct things and intelligent people can believe incorrect things. And if you were basing the belief system you believe in on average IQ, you’d go with atheism anyway.
But none of these things are evidence. Something would be evidence even if everybody in the world disagreed. Relativity was true even when every single physicist (a group of rather educated people) just knew that Newtonian physic was truth.
Me: Writes on hand “Aumann’s Agreement Theorem”. Thank you Eliezer, you have no idea how much easier you just made my Theory of Knowledge class. Half of our discussions in class seem to devolve into statements about how belief is a way of knowing and how everyone has a right to their own belief. This (after I actually look up and confirm for myself that Aumann’s Agreement Theorem works) should make my class a good deal less aggravating.