There are many places too, as a programmer, where I say the same thing. I do most of my work in the application stack, and have only the vaguest understanding of what goes on in the guts of the operating system and kernel. I trust, though, that someone has spent time and energy thinking about how the operating system and its API work. I also suspect that if a fey mood ever took me, I could work my way through the kernel code of linux and understand what's going on. The reason I haven't is that I spend most of my time at a different level of abstraction.
The system of beliefs that underly Christian faith are similar. Many people work at a level of abstraction, if you will, that doesn't involve the sort of careful analysis that is, nevertheless, possible. Other Christian thinkers have explored the interplay of reason and faith with extraordinary detail. When someone says, "I'm happy to stop my analysis here", it might not mean that what underlies their belief is irrational, it might mean that they haven't had the time or the inclination to examine the layers of abstraction beneath it.
It's like a beginning programmer looking at a hash table object and hitting 'view source'. What kind of programmer would he be if he didn't want to see behind the curtain at least once? How could he be expected to excel?
Your example about a programmer peeking into the hash table is germane, because the hash table's "implementation" is, itself, composed of interfaces. Following your argument, how could a programmer be expected to excel if he didn't understand those interfaces? And it's turtles all the way down until you hit Feynman diagrams.
That's doesn't seem to be how people actually work. At some point, a layer of abstraction is leak-proof enough to satisfy curiosity and allow meaningful work to be built upon it. Where that point is will vary from person to person. Much as some people are content to work with a vague notion of Newtonian gravity, some Christians are content to live with a fairly abstract and vague understanding of theology. There's nothing wrong with that. We call people who wrestle with abstractions surrounding the natural world scientists, and we call people who wrestle with abstractions surrounding God and faith theologians.
[1] Well, Newton explicitly disclaims this. I haven't read Einstein recently enough to remember whether he disclaims it explicitly, but I think he certainly is no Aristotelian.