Sam Harris is calling for volunteers – Christians and Non-Christians to take part in surveys which will help study belief. From the site:
We are preparing to run another fMRI study of belief and disbelief, and we need volunteers to help us refine our experimental stimuli. This promises to be the first study of religious faith at the level of the brain. By responding to the four surveys I have posted online, you can make an enormous contribution to this work.
Please visit SamHarris.org and participate in as many of the surveys as you can.
Each survey has about 100 questions and takes about 15 minutes to complete. There are some tricky questions (there’s also some rather odd ones) so make sure you read them properly!