Christians follow the New Testament, not the old, Christ cancelled it out.
Some of Leviticus still holds true, though . And I think if you use one rule from it, you should use them all.
For example Leviticus 19:19
'nor shall you wear a garment of cloth made of two kinds of material'
still resonates as most polyester/cotton shirts are an abomination.
Stoning wizards would sort out all this Harry Potter nonsense and I'm sure we're all heartily sick of seeing cattle of different types in the same field.
Now that I think of it, if we were were to stone to death everyone on a building site that blasphemed or cursed , it would free up a lot of jobs.