It's hugely popular in Pentecostal/Evangelical churches and in fact, was given to me by an Assemblies of God friend. I was a little wary of it, given that I'd just converted to EO, but since it was a gift I thought I'd at least look it over. There are parts of the book that we can agree with such as God has a purpose for each of us. Pastor Warren submits that when we align our lives with God's purpose, we are transformed. This also is true, but though he comes close to the concept of theosis, he quickly loses it and diverges over to something eles altogether. But the most troubling aspect for me is that he uses 15 different versions of the bible and, as OrthodoxFairyQueen wrote, Pastor Warren "misquoted and mangled Scripture" leading to "misenterpretations... Translations were used based on which one made the exact point the author wanted to make." I couldn't have said it better. The final analysis (as far I'm concerned) is this: Pastor Warren makes some very good points and is obviously very sincere in his beliefs. But rather than trying to separate the wheat from the chaff, it would be much more beneficial and healthy to read something like The Ladder of Divine Ascent.