If we believed the Bible was true, it says that God created the universe. It is impossible to create something that you are bound by.
The reason why science cannot test for God is that he exists only in this universe when it manifests itself....
Now, we can hardly take the Bible to validate that Jesus was a manifestation...I wish we could. Or, perhaps the burning bush? No, there is no evidence of God because science cannot test for it....because God does not exist unless it chooses to manifest itself....which doesn't and hasn't happened....according to known archeological and scientific record.
Religious beliefs are all mystical. Take them or leave them.
Still, the existence of God is a valid hypothesis....it just doesn't make sense to hold the hypothesis in the absence of evidence.