Originally Posted by Damien

The Big Bang and Evolution are not treated the same in science. Different scientific theories have different levels of confidence.

The Big Bang is currently the most widely supported theory for how this Universe started with most of what we understand about it to be consistent with the universe we can observe. It explains what we do know such as the fact galaxies are moving apart from each other, the energy that would have been required to create the matter we know of and the Cosmic Microwave Background.

But the Big Band remains the best-accepted theory and is not considered proven. It's just the one that has the most evidence so far.

Evolution is much further along.

They're all called theories though because it's an explanation of how things work. It's still called 'the theory of gravity' for example.