A recent atheist caller to the radio show made this claim over and over in different ways during his discussion with Greg. The caller identified himself as a Hitchens convert from Christianity and believes there's no evidence at all for Christian claims.
Greg had a discussion with a critic on the radio show recently, which illustrated something to be alert to in conversations: moving the goal line. When you're posed with a challenge and then answer, don't let the critic move the goal line on you by changing the question or the terms before acknowledging that you answered the question. Otherwise, you'll get frustrated pretty quickly chasing that goal line that keeps moving out of reach. The objection in this conversation was that pro-lifers can't object to abortion unless they're doing something to help children already born. What counted as helping kept changing throughout the conversation.