Russell was an atheist, but not a materialist. His observations on philosophy of the mind are of surprising relevance today.
Just as humans are merely one accidentally evolved animal among many, our universe is simply one accidentally evolved universe among many.
If naturalism is true, then we ought not to trust our capacity for reason, and so, ought not to trust arguments in favor of naturalism.
Materialist reduction is never the whole truth. It always leaves out that which is most human and most real.
Here’s the likeliest result of adopting materialism, Darwinism, whatever you want to call it, as your guiding philosophical framework.