A "cult" would not be defined by its theology, but rather by its behavior.
See [
www.culteducation.com]
Also see [
www.culteducation.com]
A cult's stated beliefs or the supposed purpose of its existence might be politics, therapy, protection of the environment, art, a marketing concept, commercial enterprise and/or a composite of almost anything.
There are some evangelical Christians that define the term "cult" based upon their own theology, but this is not an objective way to define the word.