Why do scientists believe the Big Bang created the world? in Off-Topic Posted October 5, 2006 It's a theory. There is not proof for it because that would require them having been there at the time. The reason the theory exists is because there's evidence to support it. Why not look at the wikipedia page for it if you need extensive info? WRONG. Theories can't be proven by experimenting. Being there "back then" has nothing to do with it. Laws can be tested over and over again. Notorious_Ice. In an earlier post you stated that the greeks and romans "created" gods. You need to learn how to state your opinions a little clearer. When you make a statement like that, you are sounding like you KNOW for DANG sure that it is that way. You should use pronouns like "some people believe..." etc.... I am not saying you don't have a right to you're opinion (I am christian). You most certainly do. I just say when you make points, to at least have some footing to do it with first.