Here are a few salient quotes in context for further discussion:
The more often Christians have to resort to background beliefs—the more often they have to resort to their overall religious worldview to defend a particular tenet of faith—then the less likely their faith is true. Link
Christians must be convinced that their faith is nearly impossible before they will ever consider it to be improbable, which is an utterly unreasonable standard. Link.
When Christians criticize each other I think they're all right. Link.