I'd point the discussion to Jesus. Here's what I would say... "I can tell that you are spiritual. Just by observing the world around us, there is such a necessity for something more than the material and that's hard to ignore. I think we have agreement there! Have you thought much about the person of Jesus? I mean like...who was he REALLY? He was so impactful that everyone and their worldview has to do something with him. They have to find a place for Jesus somewhere. Many will say he was just a good moral teacher, Islam says he was a prophet but never crucified, etc. Why don't we meet for coffee, and we can talk about some of the core things that Jesus taught? We can also look at the resurrection. If he really did rise from the dead, as he predicted, that's a pretty good reason to take his teachings about God seriously."

In a purely natural, materialistic world, free will is definitely an illusion. There is no "you." You are simply just a walking chemical reaction, bouncing and reacting off of other chemical reactions that are also happening around you. From a Biblical perspective, you also won't find a truly free will described in much detail at all (if anywhere). However, we do know that our wills have corrupted as a result of the fall with a bent towards sin.

I hate that I'm going to miss this!