"it's self-evident. if you believe in unprovable things your brain is defective."
not so long ago, radio was considered to be "magic". "Unprovable" things could also be worded as "things we haven't been able to prove / have not discovered / our senses do not detect, yet". We know that ultra violet light exists, but our eyes and brains do not detect it. Without technology, we would not know that UV existed, so, using your premise, our brains are defective. Uh, wrong...
This: "religion is the politics of spirituality". IOW, a smart person sees through the dogma of a religious sect, which is, after all, nothing more than a social group that functions the way all social groups do. They have rules of membership, and it is these rules that smart people see as being irrelevant to their spiritual values. For example, it is not true that you will go to hell if you are not baptized by complete immersion. Silly. Smart people see that there is no need to belong to a particular religion to have any spiritual values, and by and large, they are suspicious of the motivations of the religious leader, and skeptical of "worship"of some deity. Which is why some religions have a fit if you do not belong to a religious group. That makes you a threat to the foundation fo their social group, and they can't have that, so, whether you be atheist or an independent believer in some sort of cosmic order / cause and effect / karma, that makes you "the enemy". Religions do not liek people who ask too many questions and they insist that their dogma be taken on faith alone, and you are showing a lack of faith by asking too many questions. Which is why I got out of organized religion long ago. They do now want their followers to be too self aware, because self awareness leads to seeing through a social construct, and society in itself.