Penn (from Penn and Teller) had a video on his vlog "Penn Says" that basically supported proselytizing. The argument was that if you think you are right about an afterlife, supreme being, etc, you basically have a civil duty to tell the world.
This video has been used by a number of churches, which has trickled back to Penn.
In this video, Penn discusses some of the reactions to his post, including an experiment to test the efficacy of prayer.
News Post: Brightgrave 1
39 minutes ago