The intersection of grief and faith is a bit complicated, whether in reality or as fiction. No two people grieve the same way, and no two cultures have the same structure for what happens when a loved one dies. First time feature film writer-director Shawn Snyder dives right into the nitty gritty of science, loss and faith, and delivers a charming, quirky, human and, at times, macabre, film in “To Dust.”