Timothy Keller started Redeemer Presbyterian Church in New York in 1989. It now attracts several thousand members to worship every week. His book "The Reason for God" answers the questions he is commonly asked by sceptical New Yorkers. He engages with Atheist Norman Bacrac editor of the "Ethical Record" - a Humanist publication. They debate whether Christianity's exclusive claims are arrogant, and whether people alone can be the best judge of what is right and wrong.
For Tim Keller see www.redeemer.com and www.thereasonforgod.com
You can hear more Christian/Non Christian debates at www.premier.org.uk/unbelievable and subscribe to the podcast
If you enjoyed this programme you may want to listen to
Unbelievable? 27 Dec 2008 - Bits & Bobs end of year special: featuring Bishop Tom Wright, Timothy Keller & David Robertson
Unbelievable? 26 Jan 2008 - Morality - do we need God to be Good? Gavin McGrath and Marilyn Mason