The Tralfamadorian philosophy of time and experience and the Earthling philosophy of time

Why does Billy become an apostle for the Tralfamadorian worldview? Here you must analyze the contrast between the Tralfamadorian philosophy of time
and experience and the Earthling philosophy of time and experience. Yet, with his novel, how/to what end does Vonnegut contest (critique) the
Tralfamadorian philosophy?