I disagree, I think there's plenty of evidence for God (if there weren't, I might not be a Christian). As for balancing God's omniscience/omnipotence with our free will, I think that's just something you have to accept. Many people who are much smarter and wiser than me have tried to come up with a solution, but here's what I think. I think that God is all-knowing and all-powerful, but he "offloads" some of that power and decision-making to us. I'm really not sure of a metaphor that would work for this, I could say that it's like He's reading a book and can flick back and forth to see what happens, back that wouldn't work because the book's already been written. I could say He's writing a book but that wouldn't work because the writer has complete control over everything the characters do. I could compare Him to a human king, but kings don't know everything that happens and they don't care about everybody.