It's not the belief that makes you "stupid" is the irrationality of the whole package. If you're looking for metaphysics answers - we got them. People tried to figure out this stuff since the beginning of time with rationality and logic and even experiments rather than blind faith to words they never even heard personally. That's the difference.

I don't discriminate against the religious but it's really easy to argue that reglious approach is taking the easy approach to metaphysics and it's something important to consider here.