Biblical knowledge or discernment isn't something many professing Christians seem to have today. If they knew anything of God’s Word, Rick Warren and his books would have been rejected from the start and he would have been treated as the wolf in sheep’s clothing that he is. It didn’t take much reading in his Purpose Driven Life (PDL) books to discern that it was horribly unBiblical and representative of a completely different gospel and Jesus and spirit (2 Cor 11:4) than that