to what extent can hamlet's failure to achieve a quick revenge be attributed to his views on sin and salvation

Hamlet's revenge isn't very quick. While Fortinbras, Hamlet's character foil, would have gotten his revenge right away, Hamlet debates the meaning of life. Hamlet seemingly endlessly ponders the idea of Heaven and Hell while he goes about his long convoluted plan for revenge. That is basically Hamlet's nature. He muses about the metaphysical and its relationship to what he does (for revenge) or doesn't do.