To complicate matters, I only remember seeing a trailer, and am not sure whether it was for a film or a television series.
The trailer was set in the present time, but it became apparent that in this universe it was a capital offence to practice witchcraft.
The most striking scene I can remember was the demonstration of a "witch execution chamber". This was a white room behind a glass screen. There was a raised stage with a metal grid on the floor, with gas burners underneath, and a metal beam rising from the floor, with manacles to restrain "the accused".
The other scene was a crowd scene with someone in the crowd pointing and accusing another member of the crowd of being a witch.
I would have seen this in late 1999 or early 2000.