I think both C, Python and Scheme are all perfectly fine choices for a first language. It really depends on what you want to do.

Want to learn how a computer works? Learn C.

Want to study abstract comp-sci concepts? Learn Scheme.

Want to wire together libraries to get something running in the messy real world? Learn Python (or something similiar).

A well-rounded CS education really ought to include all of these to at least some degree.