Not all Christians believe God's omniscience extends to knowledge of future actions. The user ChadWooters doesn't, for example. For him and the like, the future doesn't exist and a we have libertarian free will to do otherwise than we in fact do, so it's not possible to know beforehand the outcome.
"The reason things will never get better is because people keep electing these rich cocksuckers who don't give a shit about you."
-George Carlin
-George Carlin