I told some bible thumping Christians that I was an Atheist today, to get them to **** off!

[Pjams]

My go to is tell them Crom is my god and he stands strong upon his mountain. They usually find this confusing and leave. But telling them to go fuck themselves works just as well, if not a bit more crass. (This method is equally effective against other solicitors and morons, not just christians)