To the many stories of those moving from atheism to faith in Christ, we add the following, a story of a highly-educated Oxford grad who was faced with an intellectual challenge to what he believed. You can read about it over on bethinking.org, which you can read about here.
As part of the article says about C. S. Lewis, “As he rightly points out, we cannot complain about the existence of evil and suffering, and use that as an argument against the existence and goodness of God, unless we first believe that the standard of right and wrong by which we judge and condemn our world is an objective one. . . But if this is the case, what explains the existence within us of this inner moral code or compass? According to atheism, human beings and all their thinking processes are simply the accidental by-products of the mindless movement of atoms within an undesigned, random, and purposeless universe. . .
In other words, Lewis argues, atheism cuts its own throat philosophically, because it discredits all human reasoning, including the arguments for atheism. ‘If the whole universe has no meaning, we should never have found out that it has no meaning: just as, if there were no light in the universe and therefore no creatures with eyes, we should never know it was dark. Dark would be a word without meaning.’ ”
This story of the atheist who turned theist is added to the many more thinking atheists who did the same thing, not the least of which are Anthony Flew, C. S. Lewis, J. Budziszewski, Lee Strobel, and Frank Morison.