I don't believe in it because its wrong. A concentrated mass that existed out of nowhere, then explodes creating the universe and expands until now.
First of all, objects cannot come out nothing because everything has its beginning. Therefore the idea of the explosion that had occurred some billion years out of nothing becomes wrong. Nothing can come out of nothing. So for the big bang to explode, it must have a creator however, scientist disprove the existence of god. So that means has never had a beginning which means it didn't have its space nor time which is necessary for physics theories.
Second, according to some of Einstein's quotes, this is very interesting one:
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For the universe to be infinite means it has infinite energy, size and everything. Now for the universe to exist, it must have had something exist before which includes space and time. The universe's infinite size and energy exceeds beyond human knowledge. For the universe to exist, it must have its creator who has infinite amount of power to create the universe.
That cannot be the big bang because it comes out of nothing and nothing comes out of nothing. So that means that something that had everything to begin with was no other than God. Some people will ask questions like how existed and some stuff.
-Infinite energy that creates the universe has to come out of nothing and backed up by ancient books that go million years ago.
-No one can create god because god has always been there.
This video should also clear things up:
[video=youtube;FToolbwnijk]http://www.youtube.com/watch?v=FToolbwnijk[/video]