Consulting a fortune teller isn't merely a superstition. It's specifically forbidden by the Bible.
(Deuteronomy 18:10-11 NIV) Let no one be found among you who sacrifices his son or daughter in the fire, who practices divination or sorcery, interprets omens, engages in witchcraft, {11} or casts spells, or who is a medium or spiritist or who consults the dead.
Fortune tellers are usually frauds but there are some who are in contact with demons and that's how they get their information. The demons can lie too. Like say your spouse is having an affair when they're not.
Tarot cards and ouija boards are examples of occult items that a Christian should not even have in their house.