What Christianity is all about...

I am in the process of reading N.T. Wright's Simply Christian for the 3rd time. I have this quote from the book up in my office (my office is becoming filled with stuff like this) from Wright that I enjoy re-reading from time to time. The quote can be found on page 92; for those who do not have this book, I cannot recommend it enough.  

“Christianity is all about the belief that the living God, in fulfillment of his promises and as the climax of the story of Israel, has accomplished all this—the finding, the saving, the giving of new life—in Jesus. He has done it. With Jesus, God’s rescue operation has been put into effect once and for all. A great door has swung open in the cosmos which can never again be shut. It’s the door to the prison where we’ve been kept chained up. We are offered freedom: freedom to experience God’s rescue for ourselves, to go through the open door and explore the new world to which we now have access. In particular, we are all invited—summoned, actually—to discover, through following Jesus, that this new world is indeed a place of justice, spirituality, relationship, and beauty, and that we are not only to enjoy it as such but to work at bringing it to birth on earth as in heaven.”