[flyinRyan]

This is totally wrong. Different languages have different levels of power. Sure, you could always write an interpreter but that's exactly the difference between a power language vs. a weak one: to do X will I need to write a whole interpreter here or can the language just do it?

Lisp is so powerful because you can do things like delayed evaluation of arguments, via macros. With Haskell you don't even need this due to the lazy evaluation.