How you could possibly think that it is God centered no longer to believe that Jesus died for all men, as the scriptures say, is to be centered to go against the Word of God.
What I said was that John Piper lives a God centered life. His life is centered on Jesus Christ and bringing Him glory. If it takes a belief in TULIP for John to do this then glory be to God!
I personally do not need a belief in TULIP to live a God centered life and bring glory to Jesus Christ. I live a God centered life for no other reason than my admoration of the death, burial and ressurrection of Jesus Christ and because Jesus Christ saved a wretch like me and I am forever grateful!
John Piper may or may not misunderstand TULIP, however, I mark the man as one who lives out his faith in Jesus Christ to the max. Something that is more and more rare to find nowadays. I don't despise my Calvinist brothers in Christ. If they need TULIP to motivate them to living God centered, then as I said, to God be the glory!
On the other hand we have SBM, who gives Calvinism a dark side, even denying the brotherhood in Christ, simply because of a nonessential doctrine such as TULIP. I feel bad for him, we need to pray for him.