the.com/denominationalism

means The practice of organizing Christianity into separate branded institutions — Baptist, Methodist, Lutheran, and so on — each with its own doctrines, leadership, and sense that it's gotten the details right.

from Built from 'denomination,' from Latin 'denominare' — 'de-' (thoroughly) plus 'nominare' (to name), itself from 'nomen,' name. The word first just meant 'a class of things sharing a name,' the way coins are denominations of currency. Applied to churches from around the 1600s–1700s, as Protestant groups multiplied and each needed a name to distinguish itself from the others. The '-ism' tacked on later turns the fact of having denominations into a whole worldview — the system, and the loyalty to it, of picking your named camp.