Scheme community frowns upon mutating code. R6RS even forced that by default, though the rest of the specification was a mess.

So, scheme style these days is all about pure functions, tail calls and continuations. To think about it, that really is setting it apart from common lisp.

Th Scheme language allows, and the Scheme community encourages, functional style, but it's still up to the programmer to write their programs that way. In Haskell, there is no other way -- even imperative programs in Haskell are functional!