Competing Theories
Here's a schematic table that shows the differing positions of reformers and conservatives on questions of the afterlife and the nature of ghosts.
(Clicking on the blue or green text will provide more information on the issues.)

Factions
Conservative
Catholic (Papists)
Reformers
Protestant
Purgatory
Ghosts

Conservative Reformers
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Spirits occupy the bodies of the dead. or Spirits create forms to inhabit.