They are not good luck charms. Third, Mary promised that, with certain conditions fulfilled, she would intercede with God in a special way on behalf of people who die wearing a scapular. Furthermore, the Church does not teach that one must wear the scapular, pray the rosary, or cultivate a devotion to Mary. Whoever produced that pamphlet should expurgate the offending statement from future printings. The pamphlet misrepresents Catholic teaching on salvation, distorts Mary's true role in God's plan of salvation, perpetuates the false idea that Catholic piety is superstitious, and is a serious source of scandal to those who are given the impression that Catholics believe in salvation by works.
Fundamentalists say holy water is a superstition that has no basis in the Bible.
This shows that holy water not only has a basis in the Bible, but that it has been around since the days of Moses. Holy water was used for numerous Old Testament ceremonies that involved ceremonial sprinklings and washings. Today we are not bound to perform those ceremonies, but the fact holy water was used at all proves that it is not a superstitious or invalid practice.