In this case, you don't need it; logic and common sense will suffice. Having all the mass in the universe collapsed to a point would be the mother of all black holes; how in hell's anything supposed to "big bang" its way out of that??
Other than that, the notions of an expanding universe and a "big bang" have been shown to be based on nothing more than a misinterpretation of redshift data, as the Dragonscience site and Halton Arp's own site will note.