It is now accepted by some that as time, the universe has always existed and will continue to exist for eternity. Therefore the Big Bang or any other theory of cosmology which suggest the universe has a finite existence if a false and mythical concept. Others believe, the universe at one time did not exist and that by some means it came into existence.
Objectivism regards reason as an absolute. It holds that all knowledge is based on the evidence of the senses. It holds that all beliefs, conclusions, and convictions must be established by logical methods of inquiry and tested by logical methods of verification. In short, it holds that the scientific approach applies to all areas of knowledge. Blind faith, by contrast, consists in belief not based on evidence, or based on such spurious forms of "evidence" as revelation and authority.
Objectivism rests on a premise that supernatural dimensions do not exist when the facts stipulate otherwise. Matter is simply one form of energy. This relationship between matter and energy was expressed by Einstein’s famous formula E=mc2 (energy equals mass times the speed of light squared). This equation reveals that a little mass, or matter, harbors enormous energy and that energy can also be turned into matter. Neither constant can emerge from empty space.
String theory alone may one day find some evidence for the "infinite universe," but the pre-Big Bang models based on string theory are fundamentally un-empirical. Furthermore, as it currently stands, those models appear to be fundamentally incompatible with current cosmological observations as well as the enormous number of non-empirically based ideas that go along with them.
The Ekpyrotic/Cyclic models that they are working on end up positing extraordinarily complicated mathematical "entities" or "bulks" (fancy word for bigger universes) that require a tremendous number of non-trivial assumptions that are based on nothing other than "to make it work out." So sure, you can hold out for one of these theories. But you don't get to pretend that you're sticking with empirical or scientific ideas. You're at least as religious as any hyper fundamentalist in any religion. If one insists on holding out for a scientific answer, then you will never find the answer. Any proposed explanation for the origin of the universe will be metaphysical and outside the reach of empirical science, whether it is theism or a string derived model.
The forming of the material universe may thus have involved the transformation of matter and energy from an infinite source. The Bible shows God to be the source of the energy locked up in the material universe. (Isaiah 40:26) The idea of exalting the spirit over the material existence of the body has long been tightly connected to religious thought in Christendom's churches to the idea that there exists some reality beyond the material world we know through our senses, a world our spirits long for as an escape from the needs of the body and the constraints of physical reality. Evidence for God in its most genuine sense is God's active force.