Mr. Warren preaches in sandals and a Hawaiian shirt, and he encourages ministers to banish church traditions such as hymns, choirs and pews. He and his followers use "praise team" singers, backed by rock bands playing contemporary Christian songs. His sermons rarely linger on self-denial and fighting sin, instead focusing on healing modern American angst, such as troubled marriages and stress. . . .You can read more here.
Christians have long divided over efforts to adapt and modernize their faith. Some believers worry that purpose-driven techniques are so widespread among Protestant churches that they are permanently altering the way Christians worship.
The Baptist Press rebuts the article here.