Evolution is about life only. And the difference between a ferarri engine and life is this:
1) no plausible natural mechanism exists to explain the existance of ferrari engines. A plausible natural mechanism does exist to explain the diversity of life on earth. It is called evolution.
2) We have observed humans making ferarri engines. We did not observe anyone making life.
I argue that we only assume intelligent design if either we have observed the designer making the object, or if we cannot imagine any natural mechanism that could have produced it. In fact this last one is not foolproof, as even if we know of no natural mechanisms we might very well discover one in the future. For example there was a time when there were no known natural mechanisms for the weather. Man therefore wrongly assumed the weather was ID. This really highlights why we should never assume ID but should always seek natural mechanisms.
I see we are on the same page :)
2) We have observed humans making ferarri engines. We did not observe anyone making life.
Sorry, but neither idea works. Evolution isn't plausible to me and I've never seen anybody build a Ferarri engine.