I'm not sure how many people suffer from this, but I am absolutely paralyzed by choice.
I've had to train myself to make arbitrary choices just to get anything done. People who know me well know that when confronted with a mostly trivial choice (like where to go for dinner), I simply choose one option, with no rhyme or reason. Part of this is because I think people usually already know what they want beneath the layers of pro/con analysis. When a friend is struggling between two relatively equal options, I will boldly declare "Option A!". Typically the response I get is either "yeah, let's do that!", or "no, I want to do the other one!". The response is rarely continued indecision.
But the other reason I make an arbitrary choice is that it's impracticle to do extended decision analysis on every trivial decision. My natural inclination is to figure out all the tradeoffs offered by each of my options, and try to make the right decision. But the consequences of making the incorrect dinner choice are negligible compared to the amount of time you'd have to spend making the "right" choice- particularly in matters of taste, where there is no obvious definition for the "right" choice.
But my indicision extends a lot further than this. I went to a drive through the other day, and my total was $8.40. I gave the guy a $10 bill, a quarter, a dime, and a nickle. He came back and gave me two $1 bills and a nickle. I looked at him confused. He said "you gave me a quarter and two dimes". I knew this wan't the case, but after a few seconds of arguing, I just gave up (he was positive he owed me 5 cents, and it didn't seem worth it to keep arguing). But as I was pulling out, I got to thinking about my relative certainty that I gave him a dime and a nickle, not two dimes. Could I be wrong? Absolutely I could. I've done stupid things like that in the past, not looking closely enough at what I was doing. I was 99% sure of myself when I first gave him the change, but I was somewhere between 90% and 95% sure I was right after he argued with me. So far, so good- I got some new input and updated my bayesian priors. It just so happens that I trust myself a lot more than I trust random-drive-through-guy.
But then I got to thinking on how much I would bet on the fact that I gave him a dime and a nickle. Would I bet $100? Or $1000? Or my whole life's savings? I realized that, even though I felt very sure I was correct, I still wouldn't bet any amount of money that I wouldn't be totally fine with losing. When I did my decision analysis, I cared a lot more about the difference between the end states than I did about the liklihood of each of these states actually happening. I cared about my maximum gain and maximum loss a lot more than I cared about my expected value.
My point is that, while I tend to implicitly trust my own intuitions when it comes to claiming truth, I tend to doubt them quite a bit when it comes to acting on truth. When I have to make a substantive choice based on my beliefs (a choice that involves actual risk and reward), I find that the very presence of someone telling me I'm wrong with absolute conviction is enough to confuse my decision making engine. It seems that I just tell myself I'm 95% sure- but my actions say otherwise.
I suspect you know where this is going, but I'll finish the thought anyways. The parallels between this and religion are pretty obvious. We're bombarded on all sides by people telling us they know the truth- entirely, completely, almost comically assured that they are correct- and each of these people is pulling us in a different direction. Any confidence I had in my conclusions evaporates as soon as I meet another (seemingly reasonable) person who believes quite the opposite.
I find that I can pick my way through this minefield much better on matters of fact (the historical nature of the old testament, for example) than I can on matters of personal experience. Our reason is so colored by our experience that its difficult to say which religion is even being reasonable, much less which, if any, is right. Religion tell me that this is the point where faith takes over. Science tells me (and my own natural inclination is) that a retreat to faith in the face of uncertainty is the surest path to being wrong.