If you're talking about life, do some research on the various theories of abiogenisis. If you're talking about the universe, then you'll have to wait until quantum physicists figure out what happened during the big bang. Saying that someone made it doesn't explain how we came to be, because then we need to figure out how that person came to be. All you're doing is pushing the question back another step, not actually answering it.

And how are those equal? Last I checked, they were antonyms. Occuring naturally means that no one did anything to it, that it occured on it's own. Intelligently designed means someone made it happen in a specific way. Those are mutually exclusive.