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 (in whatever terms it is expressed): "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.
The purpose of this message, while it is far from being a theological treatise on the topic, is to shed some light on this seeming spiritual enigma that has caused many to hold untrue opinions and maintain destruction-producing misunderstanding about this somewhat complex matter.