There is faith/belief in Christ, and there is belief in propositions.
I realize that simply saying you believe in Christ doesn't mean much if what you think of as Christ is a relic or a statue — or even a funny knot on a tree in a swamp in the Mississippi delta. So at some level, the propositions are not without importance. But when your propositions extend too far beyond the basic identifier of who Christ is, then they become excess baggage and even begin to raise questions as to who/what it is that you believe.
For example, if you feel the need to have a statement of faith concerning:
Angels
Too much detail on the trinity
The rapture (pre, mid, post, pan, etc.)
The millennium
The ministry of certain persons, living or deceased
You get the picture.