I recommend "The Rage Against God" by Peter Hitchins, former atheist and brother of the late Christopher Hitchins.
Peter Hitchens details a very personal story of how he left the faith but dramatically returned. And like many of the Old Testament saints whose personal lives were intertwined with the life of their nation, so Peter's story is also the story of modern England and its sad spiritual decline. Peter brings his work as an international journalist to bear as he documents firsthand accounts of atheistic societies, specifically in Communist Russia, where he lived in Moscow during the collapse of the Soviet Union. He shows that the world's bloodiest century, the 20th, entailed nothing short of atheism's own version of the Crusades and the Inquisition. The path to a secular utopia, pursued by numerous modern tyrants, is truly paved with more violence than has been witnessed in any era in history. Hitchens provides hope for all believers whose friends or family members have left Christianity or who are enchanted by the arguments of the anti-religious intellects of our age.