John Wilkins on the existence of religion
There is no such thing as "religion"; just this or that form of religious tradition, institution, or belief set.
This is a brief snippet from a comment John left on Russell Blackford's blog that I quite agree with. One of the problems I see atheists making time and again is the conflation of religious belief with institution (or sometimes tradition though I might say culture).
FWIW, as the followup comment points out, religious people are not immune to doing this either.