To many people, including many who claim to be Christians or believers in Christ, the matter of the existence and operations of the devil on earth are either basically an unknown or a spiritual conundrum. That is understandable, given the fact that unbiblical or in some cases, antibiblical, preaching and teaching on the matter is ubiquitous, even in the context of self-purported Christian churches. The central theory of that biblically-incorrect teaching to varying degrees is the somewhat misleading assertion: “Jesus defeated the devil on the Cross of Calvary.” While that statement and the set of teachings it represents bears some truth, it nevertheless is not “the whole truth and nothing but the truth!” Rather, it is actually partial truth.