It's a continuum. There are some things that all Christians believe and must claim as fact in order to be Christians. These are nonnegotiable. However, there are many others that Christians of good conscience may disagree on, as we see all the time here. So, I still think the core of Christian faith is fact-based and not blind.
I was laughing with my wife last night as I had to admit that Sharpton may have actually said something of merit with his Romney crack. :) I'm not positive, but I think you would agree that Mormonism is not a Christian faith, it is some other faith. They do not hold to the core Christian beliefs that we do, even though you and I disagree on so many other things. I don't hope or "wish" that those core beliefs are true, I consider them as facts.
I would say hey are nonnegotiable truths, but they are not (demonstrable) facts except to a believer.
Thus, the Holy Trinity, or dual nature of Christ is non-negotiable dogma of main-line Christians (Orthodox/Catholic/Protestant/Baptist) but is not demonstrable without an apriori faith.
That is the core. And it's not much. Outsiode of that, just about everything esle is negotiable and disagreeable in that bunch.
I had to admit that Sharpton may have actually said something of merit with his Romney crack
I though it is curious (if not symptomatic) that no one is asking for his resignation. Obviosuly, we have a double standard here, although I do not consider LDS "Christian" anything.
But don't get me wrong. I am all for principled discussions and not for politically correct ambiguity. People need to state what they believe in. We don't have to agree with their beliefs, but we can only expect to be free to believe and worship if we allow others to do the same, ragardless what we think of their theology.