Then there's nothing to tie that community together and it eventually gets deprioritized or simply subsumed into the general culture. Look at "creedless" denom

Then there's nothing to tie that community together and it eventually gets deprioritized or simply subsumed into the general culture. Look at "creedless" denominations over time to see how it plays out. There's no specific belief you need to hold to be a quaker for example, and as a result some quaker practices have been absorbed into other protestant churches while quakerism itself is almost dead.