|A142 : by Andy Woods
Here is my understanding: Piper's Soteriology is not Chaferian but Reformed.
Justification for him does not just consist of belief in Christ alone for salvation (John 3:16; Acts 16:31) but rather submission of every area of one's life to Christ's lordship. The best thing I could recommend to you on this is Fred Lybrand's recent book Back to Faitha (published by Xulon Press). In chapter 7, Lybrand provides documentation exposing Piper's Lordship salvation and Reformed Soteriology.