Do You Really Need to Be a Mathematician to Use Functional Programming?

There's this sort of emphasis on in order to really understand functional programming you have to learn category theory and type theory otherwise go hang it up. I would say that there was a big push toward using Haskell maybe even five years ago everything was Haskell Haskell HaskellI don't hear much about Haskell today but point being do you really have to be a mathematician to use functional programming in a practical way where you can deliver software with the right end results? "You cannot assume that the people that will read the same piece of software have exactly the same theoretical knowledge to understand what happens there"