"stu, you have a point so far, except that no scientist knows it all either"

You've missed the point pete. Just because no one person knows all there is to know about the theories, processes, physics, chemistry etc etc that means a modern car can be designed, manufactured and assembled by a single human, doesn't mean the car doesn't exist or won't work. It a massive collaborative effort, with thousands of people contributing to the accumulated knowledge over the years that means we can build these cars.

No one scientist knows it all, but when you have hundreds of thousands of scientists working for centuries then eventually we can begin to understand the world and universe we live in. Evolution is a result of THAT accumulated knowledge (as is the car).