Omega, careful with you definition of the Big Bang. A subatomic atom would have most of us scratching our heads!
The Big Bang was what is known as a singularity, like a black hole. When a star of enough mass explodes, the forces are so great as to cause a point in space where the laws of physics break down, and the density becomes infinite, and time stops. The Big Bang is thought to be like these documented phenomena, but backwards. Steven Hawking's done the biz on this, try reading his latest book for some real Science, [Universe in a Nutshell]. Incidentally I saw him this weekend when I was in Cambridge, although he's not the kind of chap you can walk up to and ask for an autograph! God Bless him, his condition really is awful. He's living proof though of what the human mind can achieve.
Anyways, back on topic. The Big Bang was a singularity, and obviously suggests an expanding universe. Einstein's theories predicted this, and many sites will blather on about how he, in his great genius, tried to introduce a "cosmological constant" to correct this expansion, and keep things steady state. What these sites then fail to mention is that in his later years he referred to this endeavour as "the single greatest mistake of my life".
That the universe was created by God seems to me obvious. As for how he did it, science may be a tool of man, but it can offer us insights and advances essential to our existence. We should endeavour to further our knowledge of the universe whilst seeking harmony with the scriptures.
Nick