John Piper, Its Not Reformed vs. Non-Reformed, but Orthodox vs. Heretical

I would like to repost a comment made regarding the article, John Piper and Rick Warren: inviting Warren says a lot more about Piper than it does about Warren :

Committed Christian correctly said:

"When I heard about John Piper inviting Rick Warren to speak the desiring God conference I thought it was an April fools joke! I'm absolutely shocked. Based on what I learned so far, I want to note that Piper seems to be trying to skirt the issue by making it in to a "reformed" vs. non-reformed" issue when in fact it is a "orthodox" vs. "heretical, false teacher" issue. Time would tell if Piper is going to dodge criticism by telling the "reformed" Christians that they are being unloving for disapproving of his choice of Rick Warren, because Warren is not reformed, when in fact we disapprove because Warren is teaching doctrines that are not scriptural...period. "

I assume by "orthodox" CC means biblical, so I agree.

"What must the people of God do in view of the existing situation? Ephesians 5:11 supplies the Divine answer: "Have no fellowship with the unfruitful works of darkness, but rather reprove them," and everything opposed to the light of the Word is "darkness." It is the bounden duty of every Christian to have no dealings with the "evangelistic" monstrosity of the day; to withhold all moral and financial support of the same, to attend none of their meetings, to circulate none of their tracts. Those preachers who tell sinners they may be saved without forsaking their idols, without repenting, without surrendering to the Lordship of Christ, are as erroneous and dangerous as others who insist that salvation is by works and that Heaven must be earned by our own efforts." ~ AW Pink "Signs of the Times":