In Earl Gaulke's book "You Can Have A Family Where Everybody Wins," he takes a Christian approach on utilizing the P.E.T. skills with religious teachings. Perhaps his introduction described it best, being appropriately titled "Needed: Skills for Christian Parents."
In his book, Gaulke cross references Dr. Thomas Gordon's P.E.T. with biblical scripture and explains in detail how to be a P.E.T. parent and a Christian parent synchronously. In doing so, Gaulke outlines many real-life conflicts that arise between parents and their children, like drugs and alcohol, doing homework, watching TV, decision making, etc.
To learn more about this book, click on the photo below which will take you to it's amazon.com page.
"Parents want to help their children grow up successfully, but too often end by harming them instead. This book tells how parents and children can grow together."
-Dr. Paul Popenoe