I’ve received an e-mail asking for a list of good books to help inoculate vulnerable young people from the contagiously infectious nonsense of atheism and also asking for a good place to start with the reading of Chesterton. Here’s my reply: 
It’s easy to prick the atheist bubble because the arguments used by the atheists, particularly the so-called “new atheists” of the Richard Dawkins ilk, are so easy to expose as nonsense. Any of these four books should help to inoculate the young man you mention from the contagiously irrational infection of atheism:
Scott Hahn & Benjamin Wiker, Answering the New Atheism: Dismantling Dawkins’ Case against God (Emmaus Road, 2008)
Thomas Crean OP, God is No Delusion: A Refutation of Richard Dawkins (Ignatius Press, 2007)
Peter Kreeft, Letters to an Atheist: Wrestling with Faith (Rowman & Littlefield, 2014)
Richard Purtill, Reason to Believe: Why Faith Makes Sense (Ignatius Press, 2009)
As for Chesterton, the best place to start really depends on your own predilections. Orthodoxy is a good place to start but, if you prefer fiction, I might suggest his novel The Ball and the Cross or a volume of his Fr. Brown stories. His books on St. Francis of Assisi and St. Thomas Aquinas are also a delight and might be a good place to start.