You see, when you embrace materialism, you throw free will out the window
I see. If nobody created us for any purpose, and our choices are the result of complex processes that are, at their lowest levels, non-deterministic, than we don't have free will. Whereas, if a being created us for a reason, we do have free will. I hate to be a party pooper, but that makes no reasonable sense, if anything, the opposite would be more likely.
Your statement would be true except for one thing - evolution and materialism are deterministic and the Christian religion specifically states that man has free will, so you have it absolutely backwards, like most of what the Darwinists say.
What more necessity can you have than "survival of the fittest" - the central proposition of Darwinism, the Deux ex Machina which allows evolution to replace God as the creator of all things?
What we know is that we exist. What is the scientific answer as to how and why?