If there's some reason the film can't get a US distributor, it probably doen't have anything to do with the attitudes of US religious conservatives. Michael Moore's films get distributed. Bill Mahr's Religulous got distributed. Kevin Smith's Dogma got distributed. Those films made money, and I doubt a single person who would call himself a religious conservative sat through a single one of them.

Most deeply religious Americans probably shun 80%+ of the films shown at their local multiplex anyway. There's enough they find offensive in most movies to cause them to stay away in droves. Most moviemakers and distributors don't look at them as part of their potential audience, so why would a distributor turn down a chance to make money off of this film just because the subject matter might offend people who don't buy movie tickets anyway?

If the film isn't being distributed, it's because no US distributor thinks the more secular, open-minded people who do buy movie tickets will pay to see it.