Are there beings on earth today that only look human but are really demons very skilled in "crazy-making"

behavior, tricks, pive aggressive behavior, gaslighting, and very EEEERIE psychic abilities. Knowing my private world, then mocking my thoughts, prayers, inner landscape with their friends (other demons???)aloud for me to overhear, destroying what is precious. Once this demon hears me think a thought like, "i love this blanket on bad nights,"...he then knows to "take it over"...swipe it every night... If I feel a fondness for a person and speak no words of it, somehow these people know and mock and slander this person, where they didn't do so BEFORE my thoughts of fondness. Are there demons on earth that fool us into thinking they are human. More importantly, is there some "litmus" test known among Christians, or any other faiths to test if a being is human?