Is one who transports people for a fee to polytheistic festivals associated with shrines or Zawaya, believing such transport to be permissible, and viewing it as no different from transporting people to any other place, considered an infidel?

If the situation is as the questioner describes, that these people commit shirk (definition) (polytheism) at these shrines and zawiyas (Sufi lodges), then it is not permissible to transport them there, and doing so would be an act of disobedience. However, ruling that the transporter is an infidel merely for transporting these people to polytheistic seasons is incorrect, for aiding in kufr (disbelief) only becomes kufr if the helper is pleased with it, or loves it, or approves of it.