I think that there are a variety of similarities between Minimus's poem (in Chapter 8) and hymns. Basically, they have the same sorts of exalted word choices and they both put the being they are aimed at (God or Napoleon) on about the same level.
In the poem that Minimus writes, there are all sorts of words that we do not typically use every day. They are used to make the poem sound more formal and give honor to the one it is aimed at. These are words like "thy," and "thou," and "watchest."
In the poem, Napoleon (like God in hymns) is really placed on a plane above the regular run of people/animals. Napoleon is called "Lord" of things and he is said to be the one who gives all things to his subjects. This is similar to the ways in which God is addressed in hymns.