That all does not end well is a given with personalities like these; that Huey is on the side of history we also know. Working to the uneasy compromise between these two dynamics is all we really ask of the plot, and we get it.
This is a frontal attack on the Mormon faith structure, accomplished mainly by harping on things about it that seem ridiculous. And when the missionaries, the vectors of this rendered-ridiculous faith, are set loose in a country where their earnest but clueless activities endanger the population (putting villagers at risk of being shot in the head or subjected to female circumcision), I’m sorry, it’s about as affectionate as Christopher Durang’s takedowns of Catholicism.