My bad; sorry to have misinterpreted your post. My opinion is that 99.9% of the time it's simple fraud (which includes people that have fooled themselves into believing they have this ability). But, as a Christian, there is a real spiritual world that does--at times--interact with the physical world.
If you search (on google or Amazon) dowsing, it is striking how much of the material has a new-age, spiritual aspect to it.
"Dowsing tools, tips, books, resources, classes. Large selection of quality pendulums and divining rods for the discriminating dowser and energy healer." -- divingmind.com
"Dowsers.com is dedicated to helping you to grow spiritually and heal through dowsing, the teachings of Walter Russell, and Celtic Sea Salt." -- dowsers.com
"This is the best site for products and information on Dowsing and Pyramid Power!! " - dowsing.com
The American Society of Dowsers (dowsers.org) is an virtual Pandora's box of new-age mumbo-jumbo. Just a quick sampling of items they sell on their website:
- Aura Awareness: What Your Aura Says About You
- Eastern Body, Western Mind: Psychology And The Chakra System
- Animal Spirit Guides By Steven D. Farmer, Ph.D. An easy-to-use handbooks for identifying and understanding your power animals and animal spirit helpers. After the...
- Plant Spirit Healing: Guide to Working with Plant Consciousness
- How To Communicate With Plants And Animals
- Ancient Wisdom by Elizabeth 'Rainbow Dancer' Elizabeth, the founder of Ancient Wisdom , LLC is a gifted Visionary, Teacher, Doctor of Divinity, Shaman of the Andean...
- Ancient Egyptian Divination and Magic By Eleanor L. Harris In this practical manual, Eleanor Harris takes step-by-step through ancient Egyptian religions, magical philosophy, techniques...
- Gaia Matrix - Arkhom and the Geometries of Destiny
- 101 Power Crystals The definitive resource for working with powerful crystals! Sparkling, luminous, and colorful, it is no wonder crystals have always been regarded as...
- 18 Ways the Deceased Communicat directly with the Living
- Enchantment Of The Faerie Realm By Ted Andrews Discover an exciting new world of marvelous beings. Breathe new joy into your life by experiencing the touch of faeries.
- How To Meet & Work with Spirirt Guides
- Math for Mystics Math for Mystics; from the Fibonacci Sequence to Luna’s Labyrinth to the Golden Section and other Secrets of Sacred Geometry, by Renna Shesso This...
And, all this was in the 1st page of results of a google search of the word "dowsing."
Whatever dowsing actually is, it's obvious that there is a strong enough spiritual dimension to it that it leads people away from the truth (the Bible) and towards spiritual error.