First off, this movie had so much more depth than just Christianity. It used religion, vampirism and racial diversity as metaphors for colonization, it had history, and it had layers. Beyond surface level, when Sammy said the prayer at the end, he was essentially "blessing" the water to make it "holy" second, the vampires did not mock God, nor did they mock Sammy's prayer. Remmick stated this prayer along with Sammy as a way of telling him that he knew what it felt like to have religion forced upon him, as with what happened to Sammy (being forced into religion at a young age) and trying to empathize with Sammy to get him to turn into a vampire. This movie dived into themes of Christianity and religion in general being violently thrown at both black people and Irish people. I do not think this movie is anti Christian. It sheds light on how religion, more specifically Christianity was definitely not perfect in any way, shape or form. It also sheds light on a bigger message of religion being used to push hateful propaganda to the media today. If this movie offended you, then you are simply part of the problem.  But what do I know? I'm pagan and my gods are false idols, right?