I personally believe the Big Bang is a plausible explanation which has some basis is science. I also believe in evolution for the same reason. I do not believe in the biblical explanation for the reason that it contradicts scientific fact and humans have been around alot longer than 6000 years.
The Big Bang theory is an explanation of how the universe evolved and it explains why the universe is expanding. It does not explain how the universe or matter originate. What created the ball of mass before it exploded? What caused the explosion (i.e. who lit the match)? I personally believe that a higher power is behind the seeds which were planted for the universe to sprout. I will believe that until science comes up with an explanation of how matter can be created from nothingness.