This is the first article in the "Freethought Debater" series, dealing with how to debate believers. Each article will contain a succint argument, debating tip, or observation about how to deal with defenders of religion, based on formal debates Barker has done with Christians.This argument (FANG, for short) is one of the "coherency" approaches Barker took against John Morehead in Sacramento (August 1996) and Douglas Wilson in Delaware (March 1997).If a religious term such as "god" or "spirit" cannot be defined meaningfully, then it is pointless to argue if it exists.