The real issue relating to exclusiveness is whether or not the Christian actually has a relationship with God, a presence of God, which non-Christians do not have. Apart from Christian spiritual formation as described here, I believe there is little value in claiming exclusiveness for the Christian way.
Dallas WillardSuppose our failures occur, not in spite of what we are doing, but precisely because of it.
Dallas WillardIf we reject the Christian answer, we still have the problem. We're going to adopt some alternative, because the questions will not go away, the questions of, "What kind of person am I becoming?" and "What is my role in that?" and so on.
Dallas WillardOther kingdoms are still present on earth along with the kingdom of the heavens. That is the human condition.
Dallas WillardRepent, for the kingdom of the heavens is at hand' (Matt 3:2, 4:17, 10:7). This is a call for us to reconsider how we have been approaching our life, in light of the fact that we now, in the presence of Jesus, have the option of living within the surrounding movements of God's eternal purposes, of taking our life into his life.
Dallas Willard