Well, if an entity shows up tossed out of heaven, who would know the difference.. Christ said the majority of the inhabitants on earth would be deceived... course that bit of wisdom gets A mass case of ‘whitewash...
The real resurrected Jesus wouldn’t be too popular cuz He would be speaking the word of God. The Anti Christ would be speaking of words soothing to our sinful ears.
(See, Granny, I DID listen in church) ;-)