Hi Diane: Removing paint from brick is always a challange. And no matter how hard you try, there will always be a residual of "paint points" in the brick.
The method I have used and like the best is to use a 7" hand power grinder, using a 40 grit carborundum disk. This really rips the old paint off but doesn't seem to damage the surface of the brick. Hearing, eye and ear protection are a must......and having arms like Arnold Schwarzennegger is a big plus, as the arms do get a bit tired after a while. But its fast!! An acid wash following the grind off process will help get most of the paint off.