For many years now I have observed and read Brian McLaren with great concern that he is just way off mark with even a basic understanding of the Gospel. He has I think been just like the liberal academics found in liberal German schools of the 19th Century and much of McLaren's teachings reminded me of just their teachings.
I'm not suggesting that Christian's should not be able to ask worthwhile and deep questions about the Christian faith, rather they need to understand that some questions are not only nonsense but have no proper framework on which to understand a correct answer when they get one or not. If you start with some autonomous human authority as your standard of Truth, ie yourself, or even a claim that Reason is the standard of truth, and not the Scriptures as the revelation of God Himself, then you will stray into the muck of liberalism and unbelief or even heresy very quickly. This is not to say that the Christian faith is unreasonable, far from it, rather it is when man takes Reason as his Standard of Truth instead of reason as a tool, with the Standard being God and his Revealed word that problems begin.
To see where the slippery slope leads, one just needs to consider McLaren's book 'Everything must change', but be careful, one must read with the same attitude the Berean's had towards the preaching of Paul.
See Don Veinot who writes very powerfully on this issue. Please take time to read it.
We ourselves need to ask: "Is it not loving to point out someone's error and call them to repentance"? And not merly that, but all Christians are called to defend the faith once for all given. Jude 3.