Yeah, good point. The reason why I'm religious (and never talk about it) is that secular beliefs can become even more extreme. At least Dan isn't actively trying to get millions of people killed.
As a Discordian, I believe that praying is to be avoided as a dangerous practice with unpredictable side-effects. Personally, I think the same applies to preaching.
Any extreme views can lead to trouble. It's intolerance to what others might think. I can think others are wrong, but I won't usually accuse them of being mentally ill or stupid. What we believe and think tends to be based on our personal situation and the information we get. Of course I have my own biases.