A cult is, by definition, a relatively small group...a lot of people are offended when you use it to describe a large swathe of a demographic. Lots of Trump voters are highly intelligent people who voted for him because they preferred him to the alternative. It doesn't mean they worship him or are so stupid they don't know better. It just means they have a different view.
Now, folks like QAnon are pretty cult-y, but in no way indicative of the larger conservative base.