Doug Perry from Fellowship of the Martyrs recommends Frank Viola and Georg Barna’s book called “Pagan Christianity”…He shares some parts from the book…
Which Jesus Do You Follow?
2 Cor 11:4 For if one comes and preaches another Jesus whom we have not preached, or you receive a different spirit which you have not received, or a different gospel which you have not accepted, you bear {this} beautifully.
Which Jesus Do You Follow? 
The sequel to “Pagan Christianity?” is out now. It’s called “Reimagining Church”. It picks up where “Pagan Christianity” left off and continues the conversation. (“Pagan Christianity” was never meant to be a stand alone book; it’s part one of the conversation.) “Reimagining Church” is endorsed by Leonard Sweet, Shane Claiborne, Alan Hirsch, and many others. You can read a sample chapter at http://www.ReimaginingChurch.org. It’s also available on Amazon.com. Frank is also blogging now at http://frankviola.wordpress.com/ .