Science proposed the big bang to explain the cosmic microwave background and the observed expansion of the universe.
Could the Big Bang have produced any of an infinite variety of universes? Not according to any serious astrophysicist.
Since I take it you're not a serious astrophysicist, please provide a source for this.
Not so Professor. A Catholic Monk, Georges LeMaitre, psoted BBT prior to the observations of CMB and Hubble during the period of time when Einstein held fast to a static universe. Dang creationists.