“Anyone, anyone.” “Anyone” is repeated in the Hebrew text for emphasis, but that emphasis does not occur in most English translations. The text is clear that no one is excluded from the consequences of their actions.
“who curses his God.” This could also be understood in a more general manner: “Whoever curses his god will bear his sin.” In that case, “god” could refer to other things besides the God of Israel (cp. Fox, The Schocken Bible).