A debate against equals the vampires are real creature?

Vampires are, almost definitely, only stories from ancient myths and legends. The original stories all featured a person or creature draining blood, and this could have been down to murder, ritualistic sacrifice or animal attack.

Only in recent stories have they become more refined and endearing, so the modern day vampire is definitely not real, and the old vampire is probably an elaboration on murder stories made by the superstitious and god-fearing.