Secular people are a natural target group for pitching rationality, since they don't suffer from one of the most debilitating forms of irrationality and also because they have warm fuzzies toward the concept of reason. From reason, it's easy to transition toward what it would be reasonable to do, namely be reasonable about how our minds work and how we should improve them. I did a Rationality 101 for Secular People presentation that was pretty successful, with a number of people following up and showing an interest in gaining further rationality knowledge. Here's a video of the presentation I made, and it has the PP slides I made uploaded into SlideShare. Anyone who wishes to do so is free to use these materials for their own needs, whether sharing the video with secular friends or doing a version of this workshop for local secular groups.