Obviously better than Christian churches. Who are uncoordinated into Catholic (western rite, eastern rite varieties) and Protestant sects, about 189+/- denominations, sects and cults.
Christians can't even agree on whether Mormons, Unitarians, Christian Scientists, Copts, Jehovah's Witnesses, Quakers,... are "true Christians".
Whether Southern Baptists have the "one true faith" is disputed by Roman Catholics. And so on for all the sectarian divisions and schisms.
I am reminded of the old joke about someone taking a tour of Heaven and viewing the sections assigned to the various sects. As the tour passes one small section, the angelic guide starts whispering, and indicates that his charge should do likewise, because "they think they're the only ones up here".