A lot of people do have a problem with the semantics; but mystic(ism) describes people with beliefs and practices that interact with a spiritual/supernatural/unseen world.
While it's true that there are shamans, witches, pagan priesthoods and so forth that practice wickedness; Christians may be categorized with "mystics" simply because we also believe in spiritual things- for the most part this is only to contrast mystics as a whole with rationalists who believe only in the material universe.
While it's true that there are shamans, witches, pagan priesthoods and so forth that practice wickedness; Christians may be categorized with "mystics" simply because we also believe in spiritual things- for the most part this is only to contrast mystics as a whole with rationalists who believe only in the material universe.