Does Christianity allow for free will?

The bible claims that humans have free will. It is also the opinion of many that as God is good, the root of evil lies in the free will of humans. How is this compatible with an omniscient God? For devine foreknowledge suggests that there is only one possible path in life to take, and the standard definition of free will contradicts this.

Even the libertarians amongst us have to admit that claiming free will through introspection is not evidence of free will, let alone it's sole proof. I think that naturally we believe we have free will. We hold on to it childishly, similar to Hume's description of why we try to find order in the world. Belief and acceptance are two seperate things though, and what I believe is that I'm mislead in inately thinking I have free will.