I don't find support of these people to be a bad thing. I find the homogeneity and cruel, almost-textually-violent reactions of redditors to non-homogenous thought to be the bad thing. Look for AMAs where the subject is positive to religion ("IAmA practicing Mormon", "IAmA Catholic priest") or opposed to same-sex marriage, etc., and see how those turn out.
reddit is extremely antagonistic toward people who they consider unenlightened. There is a culture of incivility. It's not a numbers game -- it doesn't matter for instance that a larger portion of reddit is irreligious than religious -- it's just a matter of human decency, courtesy, open-mindedness and humility, which are almost non-existent on reddit.
I have seen quite a few religious IAmAs, and, as a rule, everyone was respectful. Reddit mostly has a problem with people who try to undermine rationality and critical thinking in the name of religion, not with religion itself. If you show me a post where redditors are being disrespectful to a (sane) IAmA-er, I will be very surprised.
In fact, I remember a recent post by a theologian, it had hundreds of comments and everyone (including the poster) loved it, it was very civilized and informative.
reddit is extremely antagonistic toward people who they consider unenlightened. There is a culture of incivility. It's not a numbers game -- it doesn't matter for instance that a larger portion of reddit is irreligious than religious -- it's just a matter of human decency, courtesy, open-mindedness and humility, which are almost non-existent on reddit.