I love pieces exploring controversial topics, regardless of the opinions expressed (as long as it's done artfully). I can't argue with a stranger's experience because it isn't MY experience, so I hardly feel threatened by simply being exposed to it.
In short, I enjoyed watching this.
The animation style was appropriate for the topic and adds to the ambiance, which this animation is laden with. The drawings of the characters themselves may have benefited from increased realism to drive home how grim the tone was, but the careful use of 3D and textures helped offset this. The music was a solid choice as well.
As a side note, have you seen the Backwater Gospel? If not, search it on YouTube as I think you'll enjoy it. I have a feeling you may have seen it since your preacher bears a striking resemblance to the preacher in this video. I'm assuming it's simply coincidence and am making no judgement! I simply wanted to point it out.
Thanks again for sharing! :D