Measuring belief?
Pop quiz: What do standing in a long line outside a temple on New Year’s Eve, kneeling alone in a giant cathedral, and gathering around with 10-15 friends in an apartment room all have in common? It’s kind of an unfair question but the answer is that each of these would qualify equally as a statistical instance of “having prayed” despite the glaringly different social context and relational ramifications of the action itself.