I'm not ideologically committed to one theory of the cosmos like the Big Bang, but it seems that a Christian must be committed to some view of the universe that accepts a beginning and creation of the world (Gen 1:1). The Big Bang theory could turn out to be wrong; however, that would not mean that the universe is eternal or uncreated or did not have a beginning. Nevertheless, the Big Bang still lives in scientific circles--it is healthy and thriving in this way:
"Let us focus first on mainstream science. To what evidence does it appeal? The evidence comes primarily from geology and astronomy. The mainstream claims that the geologic formations contain rocks that were formed millions of years ago. And astronomers claim that by extrapolating backward from the present motions of distant galaxies, we arrive at a time about 14 billion years ago, when the matter and energy of the present visible universe were concentrated in a very small region of space, from which they moved outward explosively in a 'Big Bang.' The universe then gradually expanded outward to its present size" (Vern Poythress, Redeeming Science: A God-Centered Approach. Wheaton, IL: Crossway Books, 2006, page 101).
This quote from Poythress' work abides by copyright law for the United States of America. It qualifies as fair use.
Let's also not forget Alan Guth's "inflationary universe" idea which was supposed to be confirmed last year by the observation of "strong gravity waves." That development possibly was one of the big letdowns of 2014.