Not so. As I pointed out, it still wouldn't prove anything about salvation through Christ. THAT'S WHERE FAITH COMES IN, not simply believing there's a God. People can and do believe in God's existence without being saved.
Anyway, no creationist has said creationism has been or can be proven. They've just said it's more rational than believing in evolution.
Well put (granting of course that God can and did choose precisely how he brought what we see into being). The perpestive to which you refer is why John Locke entitled his book, The Reasonableness of Christianity.