The universe didn't "come into existence." The big bang is the beginning of the universe, not the beginning of matter and time and space. Those things always existed. They are eternal. If they weren't, it would violate that law. But if your saying that the universe can't be eternal, what makes...
Well actually, the universe didn't come into existence. It is eternal, never starting, never ending. A lot of creationists get the big bang mixed up with the beginning of everything. The big bang did not create matter, laws etc. It simply distributed them out. The actual source matter is...
I used to be christian. My life was defined by my religion. I had no freedom. I thought that when people tried to convince me God didn't exist that they were evil and deserved to burn in hell for all eternity. I was completely convinced God existed and there was no other possible explanation...