Buddhism does have its Four Seals that distinguishes Buddhism from "sorta looks like Buddhism."There are a great many "Buddhists" who do not like to be called "Buddhist" or do not want their leanings being called "Buddhism". What's in a name? Also, "Buddhism" is very fluid, but assigning it a name makes it sound fixed.
The Four Dharma Seals -- The Four Dharma Seals Define Buddhism