First, I am about as conservative as you get. Inerrantist; salvation by grace alone, through faith alone, by Christ alone. Vocal against the heresy known as Roman Catholicism … and on and on.
But I have to say that those who attack Rick Warren remind me very, very much of all the attackers of Billy Graham through the years. When God is using someone powerfully, the attacks come from the right and the left, with a lot of erroneous information.
I heard Pastor John Piper grill Rick for an hour and 40 minutes, one-on-one, and he confidently and clearly answered all questions in the spirit of conservative Christianity. He is probably more well-read on the Puritans and guys like Spurgeon than any five preachers you know personally. His gospel is straight as an arrow, and Saddleback has baptized 2,000 people every year for the last 10 years.
His peace plan, though born in an evangelistic heart, is not exclusively about proclamation. He is ministering to the poor as well, and mobilizing hundreds of thousands in the process. Saddleback sent almost 16,000 people to every country on earth to be involved in evangelism, and they are planting churches in 12 strategic cities around the world to help reach the final 3,600 unreached people groups on the planet. Does this give you a clue as to why Rick is so attacked?
I have yet to find a teacher or preacher that I agree with on every doctrine, and every one has their own version of the flesh. But I believe the attacks against Warren, though partially for noble reasons, are also born of jealousy and pharisaism.
We will all stand before God and give an account of how we treated other brothers in Christ. I have opposed a fair share of false teachers both in and outside of the true church. I urge you to check you facts more thoroughly regarding Rick, and start with the interview with Piper, perhaps the most brilliant, passionate pastor/teacher alive.