Sometimes there are situations in life that challenge our view of how things ought to be done. As Keith Green said: "Nobody's perfect, except for the Lord, and even the best [are] bound to fall." Nobody is going to be right 100% of the time.
We see in Philippians 1:18 that Paul didn't care why somebody preached Christ as long as Christ was preached. While it's important to act as the Bereans, we can't at the same time put God in a box especially when we see the Holy Spirit convicting people through Warren's ministry.
The Bible is clear on one thing. We are saved by the grace of God through faith in God. There is nothing we do to earn salvation (Eph 2:8-9). How God uses his Word and who God uses to spread the gospel message is entirely up to Him. If the Church is growing through ways in which we don't think are correct, perhaps we have put God in a box and it's our thinking about how God works that needs to change.
If they had the New Testament at their disposal, what would the Bereans report where Warren writes: "Jesus, who died on the cross for you" and tells his readers to "receive his forgiveness for your sins" (page 58).
Warren doesn't say the Christian life is easy or that once you're a Christian all your problems go away. Warren goes on (pages 81-83) to state "Surrender is hard work. In our case, it is intense warfare against our self-centered nature ... Surrender doesn't weaken you; it strenghtens you... You are free to choose what you surrender to, but you are not free from the consequences of that choice... Surrender is not the best way to live; it is the only way to live... There is a moment of surrender, and there is the practice of surrender, which is moment-by-moment and lifelong."
That one link mattered to me because the author quoted Warren and stated Warren never wrote about the cross and sin; when in reality two sentences later Warren wrote about the cross and sin (page 58). The author denied Warren wrote about central tenets to Christianity, the cross and sin, when two sentences later Warren wrote about those central tenets to Christianity: the cross and sin.
Yes, Satan masquerades as an angel of light (2 Corinthians 11:14-15). Yet Warren teaches the cross and sin.
You may not agree with his methods or style, but Warren teaches the gospel message. The Holy Spirit is convicting people to give their life to the Lord through Warren's ministry.
However, some choose to ignore them.
At least you can't say that no one has ever given you specifics related to their disagreement with Warren and The PDL.