Why did they go astray? Why the authority of the Bible is crucial.

After learning of the struggles in the United Church of Canada about defrocking a self-proclaimed Atheist minister named Gretta Vosper, those unfamiliar with this denomination (like myself, an American) were probably left wondering, how did they ever get to a place where a minister could openly denounce belief in God without being thrown out by his/her own congregation, let alone the denomination?  In its article on her "coming out" as an Atheist, the Toronto Star provided the answer: "In her sermons each Sunday, Vosper spoke openly about how she did not believe the Bible was “the authoritative word of God for all time” — a conviction she’d held long before her ordination, and one that is not uncommon among United Church of Canada clergy."  To Vosper, the Bible had long since become secondary.
If the authority of the Scripture is laid aside, if it becomes the words of men instead of the Word of God, there is nothing left to build upon, sooner or later, the whole edifice of the Church will come crashing down.  It is evidently not uncommon for a UCC pastor to view the Bible as optional, a position that Vosper learned, horrifyingly enough, in seminary.  There is no doubt that a similar story could be told about several American denominations, we have the same problem of abandoning the Bible here as well.
For those who don't understand all the hub-up about Andy Stanley's recent comments that we need to downplay the Bible and instead emphasize Jesus, it is the mess like the one the UCC finds itself in that frightens those who have taken umbridge with Stanley.  Andy Stanley has since responded that, “the Bible is without error in everything it affirms” and that he “believe[s] what the Bible says is true, is true,”  Where Andy Stanley was hoping to go with his message, and where those critical of that message were afraid his idea would lead, are not one and the same, but one would hope that both his supporters and his detractors can see why such comments aroused the response that they did.  
As a Church, and for myself as one of its many pastors, we must always be on our guard against the devaluation of the authority of Scripture, it is the Rubicon that we cannot ever cross.  Once that river is crossed, nothing is out of bounds, nothing is essential, Christianity without the infallible Word of God is Christianity in name only.