That leaves out situations where traditionalists in a church break away from the original church to retain or return to an older set of values. For example, would parishes breaking away from the Episcopal church because of the church’s gallop to moonbattiness be considered a “cult”?
They don’t have novel beliefs and practices. If anything, THEY are the ones with the traditional beliefs and practices.
In the case of the ECUSA, one could argue that a clandestine “cultic” group infiltrated the administrative level of the denomination.
That was the position of a judge regarding a traditional group in the bahamas seeking to break away from such a non-traditional group that had taken over their hierarchy.