This article challenges Philip Kitcher’s recent proposals for an ‘enlightened secularism’. I use William James’s theory of the emotions and his related discussion of ‘temperaments’ to argue that religious and naturalistic commitments are grounded in tacit, inarticulate ways that one finds oneself in a world. This indicates that, in many cases, religiosity and naturalism are grounded not in rational and evidential considerations, but in a tacit and implicit sense of reality which is disclosed through phenomenological enquiry. Once the foundational role (...) of these temperaments is appreciated, it emerges that enlightened secularism relies upon a facile conception of the nature of religious belief – one that lessens its chances for success. The article ends with some positive proposals for incorporating phenomenological insights into debates about science, religion, and secularism. (shrink)