How do you know that there was a 'big bang'?
If God spoke and it was there is no need for a 'big bang'.
Jesus rose from the dead, yet if you ask your doctor, 'Can the dead come to life without outside medical assistence? He will say that it is not possible.'
Yet Jesus physically rose from the dead.
If God can do that can he not create in 6 days a universe etc.
Because it's the same exact thing when you put your hands together to clap. It makes a noise afterwards. I'm not saying that's how it happened I'm just saying it's a possibility.