From my understanding of the big bang theory it sounds just as credible as any other creation story. I want one of the logical and rational atheists to explain how the big bang theory occured. I don't want to hear that the galaxies and solar systems are traveling away from each other at some measurable distance because that could be the result of anything. Explain how exactly the universe came from a bang, where all the matter was "hiding", what exactly caused the initial bang, to be honest I'll be surprised if anyone responds putting their own credibility at risk.
This is where the argument of theism vs. atheism should begin, at the original creation of the universe.