Angelology: “messenger” or “angel” and logos meaning “word,” “matter,” or “thing.” In Christian systematic theology it is used to refer to the study of the biblical doctrine of angels. It includes such topics as the origin, existence, and nature of angels, classifications of angels, the service and works of angels as well the existence, activity, and judgment of Satan and demons (as fallen or wicked angels). Some theologies, however, treat Satan and demons under a separate heading, namely, demonology.

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