Well, if an atheist reads the Bible, it might just change him. Hopefully, he will be convicted by the words of Jesus on those pages.
"No man can come to me, except the Father which hath sent me draw him: and I will raise him up at the last day." John 6:44
And then again...
"Blessed are they which do hunger and thirst after righteousness: for they shall be filled." Matt 5:6