Quote Originally Posted by crossroad
The two basic thoughts here are, either, everything came from nothing, or everything came from something. (I know some are going to go crazy with that one) But, if you narrow it down, that is what you have. It is cause and effect at the core, as evolution is built on, but evolution does not have a cause for its origin. But the Big Bang is the cause, right? No, the Big Bang is the effect of something. I choose to believe that everything came from Something.
Evolution is a theory in Biology.

The Big Bang is a snappy name made for media to descride the starting few seconds of our universe... it is part of a theory in Cosmology (Physics).

Gravity is a theory in Physics.

They are all separate theories.

Gravity has a cause for it: Classical version is the mass of objects attract each other. Relativity basically explains it as a warping of space... much like putting a bowling ball onto a trampoline will warp it, if you then place a tennis ball on the trampoline it will follow the warped fabric down to the bowling ball, if you gave the tennis ball a push it could circle the bowling ball... each circle would be an orbit.

Evolution: Is caused by things reproducing imperfectly. Overtime these errors will either kill the mutant (more likely) or give it a subtle advantage. No where in the theory of evolution is the Big Bang the cause of it. Evolution will work regardless of how the universe was started, if it has lasted for infinity or it had different laws of gravity.

In fact evolution may be the only theory that would consistently work across multiverses that have different laws of physics (it may be the only Meta-law so to speak).

Evolution and Gravity are separate theories, just as the Big Bang is too.

If everything came from something you have two sets of problems to solve... where did the something come from,
Quantum Physics:
random nature therefore untraceable cause and effect,
singularities
vacuum created particles (how we see black holes for instance).