Those limits are necessary because IF they are not in place, I become gullible to any world view that is coming my way. And gullibility is not a good thing to be.
Yes, god and religion are man-made. And it's through those lens that I view Christianity, Scientology and every other religion. You said earlier than Scientology is a scam. I agree, and I don't believe that's just true for Scientology, but for pretty much every religion there is. The premise and promises of religion simply raises too many alarm bells of "SCAM!" in my mind that are simply too hard to ignore. But for some reason here, it's perfectly reasonable to claim Scientology is a scam, but Christianity and Islam aren't. I can't accept that double standard.