I'm a christian and believe that God created the Universe, but I've never understood why people are always arguing over whether it was the Big Bang or God that created the universe. The reason being that in the Bible, it doesn't say how God created the Universe, all it says is that he created it. So it is possible that he created it using the Big Bang, and the time span of 7 days, refers to some long period of time.

So that's how I see it, so I'm on both sides really, hehe.