By considering the context of Elizabethan England, what is the importance of the Ghost in Hamlet?

When exploring the relevance of the Ghost in Hamlet, looking at the religious context of the time is particularly important because as an audience, it shapes the different ways in which we could interpret the ghost of Old Hamlet. Given that Hamlet was published around 1603, it is important to remember that within the last few decades, England had undergone sweeping religious reforms, converting from Catholicism as the state religion, to Protestantism. Whilst this may not initially seem like an issue for the play, it becomes increasingly significant because of the differing doctrines of Catholicism and Protestantism. The Catholics believed in purgatory, which would suggest that the ghost in Hamlet is just that, a ghost. However, in the new Protestant England, purgatory as a religious concept was denounced, as was the belief in ghosts, meaning that this would make the ghost a spirit or demon, most likely from Hell. With these two different interpretations, the Ghost can either be seen as a benevolent or a malevolent being, either intent on merely telling Hamlet the truth, or bringing about his ruin. Consequently, if we view the ghost as a Catholic construct from purgatory, Hamlet's decision to follow it's instructions does not appear so naive, but if the ghost is seen as a figure from hell, Hamlet's faith in it is seen as ill-adviced, thus changing the way we would view the following events in the play.