This quote is taken from chapter one of my new anthology Christianity is Not Great, after describing the violence of Christian history:
What does this do to liberal Christianity like that represented by Kimball and Spong? If the roots of their tree of faith are evil by their own standards, as they admit, then why do they still nest in that same tree? Continuing to do so is unreasonable, just like trying to incrementally reform the Klu Klux Clan from within. No, given the history of Christianity even their own particular Christian faith should be rejected, plain and simple.
With hindsight exegesis liberal believers reinvent their theology based on the lessons of history, rather than abandoning it. They need to take seriously that theirs is an evolved faith that began with religious violence and has been sustained by violence for at least 1800 years. Christianity is red with blood in tooth and in claw. Throughout most of its history violence was its theme, its program, and its method for converting people and keeping believers in the fold. Its history is a history of violence. There is no escaping this.