See the discussion here.
Well, so do I. The kind of reliability our reason possesses is not what we should expect given naturalism, Reason does not emerge from irrational (or if you insist) nonrational causes.
There is just the fact that within the Darwinian conception of how we got here, there's no reason to believe that our cognitive faculties have evolved to put us in error free contact with reality. That's not how they evolved. We did not evolve to be perfect mathematcians, or perfect logical operators, or perfect conceivers of scientific reality at the very small subatomic level or the very large cosmic level or the very old cosmological level. We are designed, by the happenstance of evolution, to function within a very narrow band of light intensities and physical parameters. The things we are designed to do very well are to recognize the facial expressions of apes just like ourselves and to throw objects in parabolic arcs within 100 meters and all of that. The fact that we are able to succeed to the degree that we have been in creating a vision of scientific truth and structure of the cosmos at large, that radically exceeds those narrow parameters, that is a kind of miracle. It's an amazing fact about us that seems not to be true, remotely true, of any other species we know about.