Dr. K. Scott Oliphint ‘s penetrating analysis of a spat within the atheist community can be found at this link. Reason alone simply cannot provide an adequate framework for ethical decision-making.
Dr. Oliphint, professor of apologetics and systematic theology at Westminster Theological Seminary in Philadelphia, has been doing some strong work in apologetics from the presuppositional point of view (now referred to as covenantal apologetics) at the Reformation21 blog. Dr. Oliphint also defends the presuppositional position at The Gospel Coalition in a debate summarized at this link.
I recommend Dr. Oliphint’s work because it brings much needed clarity to the subject.