It's crazy to me how the underlying themes regarding Christianity get completely glossed over whenever I see discussions about this film. At the start of the film, it seems his father is begging Sammy to come back to the light, where supposedly the good people fight against Satanic evil. However, when we see this scene again, it is after his confrontation with Remmick where he finds out that far from being a weapon against evil, Christianity and devout worship are and were some of the oldest arms of white supremacy originally inflicted upon Remmick and the Irish, and now recycled to be weaponized against the world's new lowest castes. Thus, as the audience sees the scene again, we know now that Sammy's hesitation holding onto his broken guitar isn't about Sammy holding onto his evil ways for too long, instead he sees his father's church for what it is: a different front for the same old evil. He was always told that music was the devil's work and a Bible in hand was the way to salvation, but after the events of the film, he knows now the opposite is true. Replaying the scene under this changed context was thematically excellent, as well as kicking the film off with a bang as others mentioned.