Yeah God has always known what will happen. He know what lucifer was going to do. But lucifer always had a choice and God allowed lucifer to do what he was going to do. He could have prevented it from happening but he didnt. Because there is a devil, becaues there are demon's, because there are evil things in this world people need to go to God for help. I didn't say God is making us need him or making us go to him, but because there are struggles, because there are things that hurt us physically and emotionally, and basically make us live in fear, that would give us the need of some higher supernatural power which is God. And when I said Evil basically doesn't exist, I meant evil can never win when we have God.

__________________