Messianic Gore BS
The man has a large and growing following because 1. He is championing a cause that is vitally important to us all and 2. many people are still angry that the 2000 election recount was stopped by the Supreme Court.
If you consider several hundred people volunteering to deliver a scientific slide show as "missionaries" you are distorting the truth way beyond reality. But then, that's what you do on a regular basis.