Religion

Why do various religious artifacts of all religions have power over supernatural beings and forces of evil?  Whether it be the Bible, Holy Water, Crosses, Crucifixes, or the countless symbols of most religions going back thousands of years.  They all have the power to repel and magically affect many of the paranormal entities that plague humankind.  In particular demonic based entities are the most vulnerable which is lucky since they compose most of the dark forces...