But isn't the history of the Christian churches that of belatedly accepting the mainstream opinion of the day?
What the Christian churches believed in in the 12 century is vastly different to what they believed in in the 16th century which is vastly different to what they believe in today. Adulterers aren't stoned to death any more nor are ladies with Tourette syndrome burned at the stake. As society became enlightened over the ages, so too did the churches, though often reluctantly and always belatedly.
I know the churches are not democracies and would not expect them to be swayed by the populist opinions of the day. But the churches are their people and people, even those who are fundamentally conservative, who open their minds to new ideas will change over time. The churches will follow suit. The old guard will die out and young blood will take its place. That's how it is and I suppose how it should be.
For the church to be true to its basis then it needs to be aware of the mainstream opinion of the day but stick to its foundations. Adulterers being stoned to death and ladies with Tourette syndrome burned at the stake are certainly not instructions from the christian bible. What the church believed during the 12th century should have been the same as they believed in the 16th century and also what they believe today. The teachings in the bible are amazingly timeless.