Imputation is 1sided but fellowship with Christ is 2sided.Koinonia means PARTICIPATION! God want your passion,not passivity — Rick Warren via Twitter
I guess I should not be surprised, but when a supposed pastor think that the doctrine of imputation is (1)one-sided, (2)unimportant, then you know that the Gospel message is not believed by him. The focus on fellowship more than the Gospel sounds more like the unbiblical Eastern Orthodox teaching of theosis than the biblical doctrine of Justification by Faith Alone.
The part about passion seems more in line with the enthusiasm of radical Anabaptism. There is nothing wrong with passion per se, but there is everything wrong when passion is the goal. Even worse, Warren thinks that God wants our passion, as if God desires our good works and high emotions.
Warren does not believe in the biblical Gospel, no matter how much "paint" Piper uses in an attempt to whitewash him. His religion is American revivalist moral therapeutic deism, and should be treated as such.