[snip ... unusually intelligent question about benefit of religion ... snip]
> Why is it ok for you to take that away from people?
It's a progression of understanding. If someone wants to believe that thunder is a result of something being upset with them then an understanding of weather might serve to improve their lives.
But, as you're inferring, this type of belief needn't do anyone else harm. However, organised religion can be seen to be divisive and dangerous. E.g. views on homosexuality and contraception.
As an atheist I'm happy for those with belief to believe what they want. However, if it's dogmatic and at some level serves to screw up (and historically organised religion has had a steam-roller elemenet to it with respect to contrary belief) the world then I have a problem with it and reserve the right to point out bigotry, incosistency and irrationality where I see it.
I don't think you're an idiot if you have faith: I think you're wrong. And in some cases that wrongness can impinge on other people's wellbeing in quite devastating ways. (Which is a broad generalisation - your post I read as an intelligent one and this reply isn't ad-hominen ranting in anyway.)