To reflect on the 1st chapter of Bevans' book I have to say the two points that really stood out and appealed to me were: 1) the shift in theological thinking from propositional to relational categories and 2) the growing awareness of how the doctrine of the Trinity reveals a God who is to be understood primarily as relational.
In many ways this amounts to the same thing: to stop trying to conceive of God in abstract terms and then feel that signing a list of statements about God is an act of faith and to realise that God is not knowable in terms of propositions but only as God is personally encountered through the scriptures, church and everyday life.
Evangelicals have long been fond of saying "it's not a religion it's a relationship" but have then proceeded to reveal a list of philosophical propositions which require your intellectual assent before you can be considered a Christian. The problem for us religious types is that when you really understand that Christ calls us into relationship rather than into a list of 'articles of faith' then it becomes very hard to work out who is in and who is out. If you can cast someone into the outer darkness for using 'infallibility' instead of 'inerrancy' to describe their view of the Bible (neither of which actually tells us anything useful) then it it easy to keep control of a religious group. But if you have to admit that the most heretical thinker might still have a closer walk with God than you do it should force you to greater humility, tolerance, and openness to other people's views. After all its not about 'being right' but about being in relationship. It's not about knowing about God but about knowing God personally.
Let me know what you think :)