If there was an FAQ on this site, your question would probably be second after, "I've invented faster than light travel, aren't I smart?".

Try these pages and let us know if they don't help. Some are more relevant than others.

http://www.last-word.com/content_handling/show_tree/tree_id/3290.html

http://www.last-word.com/content_handling/show_tree/tree_id/3067.html

http://www.last-word.com/content_handling/show_tree/tree_id/2955.html

http://www.last-word.com/content_handling/show_tree/tree_id/2632.html

http://www.last-word.com/content_handling/show_tree/tree_id/2562.html

I believe its a good idea to keep the mind open to many theoretical scenarios for the beginning of the universe, not like some eminent scientists such as Hawkings & Dawkins, because mans scientific knowledge could be  the equivalent of a student in play school rather than a graduate receiving his Phd. 

Currently there doesn't exist a way to discover whether our universe in actual fact is not a simulated one, e.g.   The God illusion like one magnificent stage set, created in 6 days 6000 thousand years ago, although this scenario seems quite implausible there exists good science to suggest we are existing within a simulated universe and therefore the simulation initiation may of began yesterday :)