There are many successful Haskellers without a math background.

Haskell can be taught as recursive programming, learning about accumulator parameters and high order functions. A background in logic (which most programmers have to some degree) is more useful than an approach in math in that regard.

What are you trying to achieve by spreading fear, uncertainty, and doubt here?

I don't have a math background. I failed high school maths.

I've been working as a professional Haskell programmer for several years.

What you are saying is just demonstrably not true. So why are you saying it?