How do I stop harment from a Christian woman?

Sadly, the only way to handle this kind of person is to show her you won't tolerate the harment. Calling your local authorities is your most logical and best move to make. You can't fight a religious bigot like this with logic, because they aren't going to listen to you. If you steps foot on your property it's tresping, if she taps signs in your yard and to your windows or doors, not only is that trespassing but defacing of private property. I know you don't want to go the route of calling the cops on her, but that's the only way to get the message across. All these things can also be considered hate crimes as well.