Re: "Christian public relations"
Well, you could always just go look. :)
You can't honestly think a print shop run by a Christian would refuse to print Jewish flyers. Where does that stereotype come from? There's a lot more anti-Jewish thinking among certain secular "intelligencia" in this country than among evangelicals. The above-mentioned DeMoss Group works with Jewish organizations.
Privately-owned publications should be able to refuse any advertising business they want.