I would conceed that there is no absolute proof of God's existence. However the discovery of laws of nature, such as gravity. All building blocks of life, the movements of the universe, planets etc do reveal His handiwork. As scientist continue to discover these laws that are already there in the first place. We are left with one inevitable conclusion......there is a Mind behind all these wonders we see all around us.
In the same manner that i believe in the existence of sir leomarley, quitacet, majoe, Nelson de leon, tony etc, etc. eventhough i can't see them. The evidence is the intellect/mind behind comments posted in this thread.
As to the bible, i would not pressume it to be better than the rest. But its impact in the world is self evident. For 2000 years it has remain essentially the same. It's teaching unwavering like "though shall not steal"(binay i am looking at you!). Its has stood the test of time and criticism. And the events, cities, personalities have been corroborated in other manuscripts.