Rick Warren, pastor of Saddleback Church in Lake Forest, Calif., and author of “The Purpose Driven Life,” says that the 16th-century Anabaptists shaped his Purpose Driven model for the church. More than 500 students, faculty members and guests from around the world attended the “Anabaptism and Contemporary Baptists” conference at Southwestern Baptist Theological Seminary, where Warren joined prominent Anabaptist historian Abraham Friesen as a featured speaker.