It is often curious to people why I would wish to engage in dialogue with atheists, especially when I emphasize that my intention is in no way to convert or subject them to Christianity. It comes at even a greater curiosity on both sides of the table for me to suggest that these conversations help me to actually strengthen and enrich my own belief. In reading the book Christless Christianity by Dr. Michael Horton of the White Horse Inn radio/podcast, I ran across a few passages that may begin to help answer that question:
The search for the sacred has become a recurring cover story for national news magazines for some time now. Although this search is often identified as an encouraging sign of interest in God, it may be more dangerous than atheism. At least atheism makes arguments and shows an interest in a world external to the feelings of the inner self. Furthermore, after each round of this quest for the holy grail, evangelicalism itself looks more and more indistinguishable from the ooze of pop spirituality more generally (page 159-60).