Has the practice of dowsing been proven to work and is it for Christians?

Even though many tests have been performed to verify the existence of a force behind dowsing, any true test must...

(1) Be capable of being duplicated by anyone who follows the appropriate steps.

(2) Be devised in such a way that the tester can not possibly manipulate the results (whether intentionally or otherwise).

To date, no claim has been found to be verified by a strict following of the steps outlined above.

Additionally, those who claim supernatural help in performing the practice of dowsing is considered divination or spiritism - a practice which is strongly condemned in the Bible. If you wish to follow the Bible, then you cannot do such things.

For much more, see
Dowsing

Practices That God Hates - #5 Magical Spells and Spiritism

Dabbling in the Occult - What's the Harm?