This is a recommendation to go read an article by Dr. James Anderson, in which he helpfully explains the related nature of moral norms and epistemic norms – and how rejecting the existence of moral norms (as hard-atheism does) seems to requires the rejection of epistemic norms as well.
It’s worth the read. Go check it out.
Moral norms and epistemic norms, while distinguishable, move in similar orbits. […] There are parallels between the two kinds of norms, even if one kind cannot be reduced to the other. [Atheism’s denial] of moral norms can be extrapolated into grounds for denying the reality of epistemic norms. If you think that talk about ‘morality’ is really just “a matter of subjective value or desire,” it’s a natural next step to think that talk about ‘rationality’ is “in the end … a matter of subjective value or desire as well.” On the face of it, it’s hard to see why, given atheism, there would be objective epistemic norms but no objective moral norms. Why would it make sense to talk about right thinking but not right acting? Why would there be objective standards that govern our cognitive faculties but no objective standards that govern our other faculties? For the atheist it’s really only a small step from amoralism to arationalism.