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Modern man was either genetically re-engineered from the neanderthal or some other hominid, brought here from elsewhere, or created separately. Those are your three choices.

Sorry, there is a fourth choice, one which the vast majority of paleontologists agree with. Modern humans descended from archaic humans, who in turn descended from earlier Homo species and Australopithecus species.

You seem to feel that because we are not descended from Neanderthal that there is no other close relative from whom we are descended. Perhaps you should examine the scientific evidence a little closer.