I agree completely. It's impossible for me to imagine a scenario where a marginal believer is negative evidence in the belief - at best you can explain away the belief ("they're just conforming" lets you approach 0 slope once it's a majority religion w/ death penalty for apostates).
r/Fitness does a weekly "Moronic Monday", a judgment-free thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. I thought this seemed like a useful thing to have here - after all, the concepts discussed on LessWrong are probably at least a little harder to grasp than those of weightlifting. Plus, I have a few stupid questions of my own, so it doesn't seem unreasonable that other people might as well.