Rigorous theology provides believers with a map of reality. These maps may seem dry and schematic — most maps do compared with reality — but they contain the accumulated wisdom of thousands of co-believers who through the centuries have faced similar journeys and trials.

Rigorous theology allows believers to examine the world intellectually as well as emotionally. Many people want to understand the eternal logic of the universe, using reason and logic to wrestle with concrete assertions and teachings.

Rigorous theology helps people avoid mindless conformity. Without timeless rules, we all have a tendency to be swept up in the temper of the moment. But tough-minded theologies are countercultural. They insist on principles and practices that provide an antidote to mere fashion.

Rigorous theology delves into mysteries in ways that are beyond most of us. For example, in her essay, “Creed or Chaos,” Dorothy Sayers argues that Christianity’s advantage is that it gives value to evil and suffering. Christianity asserts that “perfection is attained through the active and positive effort to wrench real good out of a real evil.” This is a complicated thought most of us could not come up with (let alone unpack) outside of a rigorous theological tradition.

Rigorous codes of conduct allow people to build their character. Changes in behavior change the mind, so small acts of ritual reinforce networks in the brain. A Mormon denying herself coffee may seem like a silly thing, but regular acts of discipline can lay the foundation for extraordinary acts of self-control when it counts the most.

“The Book of Mormon” is not anti-religious. It just endorses a no-sharp-edges view of religion that is all creative metaphors and no harsh judgments. The Africans in the play embrace this kind of religion. And in the context of a hilarious musical, that’s fine.

But it’s worth remembering that the religions that thrive in real-life Africa are not as nice and naïve as the religion in the play. The religions thriving in real-life Africa are often so doctrinaire and so socially conservative that they would make Pat Robertson’s hair stand on end.

I was once in an AIDS-ravaged village in southern Africa. The vague humanism of the outside do-gooders didn’t do much to get people to alter their risky behavior. The blunt theological talk of the church ladies — right and wrong, salvation and damnation — seemed to have a better effect.