IMO you are comparing apples to oranges. The scripture you quoted about “one who uses divination” is specifically talking about a fortune-teller. My God-fearing Christian grandmother would use a willow branch to find artisian wells for family and friends. It was a priceless gift to the poor folks in the country back in the hard times. She and Pawpaw picked cotton for a living.
There are plenty more scriptures warning about divination.
“My God-fearing Christian grandmother...” may not have thought through the implications of what she was doing to their logical end.
There is no scientific evidence backing any physical mechanics for dowsing—none, zero, zilch. That leaves one—and only one option—it is accomplished via some supernatural force.
Divination (as it is used in the Biblical passage I quoted)
means to obtain knowledge from a spirit. Dowsing fits that definition perfectly, since the knowledge is not obtained from a physical source, but rather a spiritual source.
Again, since the knowledge is NOT coming from a physical source, where do you think the knowledge is coming from; who do you think is controlling the dowsing rods; what supernatural force causes the dowsing rods to bend?