Your argument says we know plants, rocks, planets are designed because it uses the mechanism inside the things that we design. We designed water bottles, what's the mechanism of a water bottle and how does it relate to the other things you claim god designed?
Why do you think a water bottle has a mechanism?

''Because it uses all the mechanisms inside the things that we design'' So a bottle can't be used to prove plants are designed by god, give me an example then of your claim.
Well, the motions of atoms and their subatomic particles are mechanisms that we use inside everything that we design, and even in our design of some not-readily-seen-in-nature forms of atoms. We use natural design in all our design. It is all the same... design.
The fact that you don't know which human designed some pottery that you found in Asia, doesn't mean that it wasn't designed. The fact that you don't know much about the designer of al things doesn't mean that all things weren't designed.
Design is all that there is. we prove it daily by incorporating natural design into all our design. Or isn't our design really design. Is our design something else because we use the stuff that everything is made of?

Ok, I asked you how do you know things are designed, you answered with this:
''How do we know it is design? Because it uses all the mechanisms inside the things that we design'' So you claimed to know things are designed (plants, humans, rocks) because those things use the mechanisms inside the things that human design. Now you are saying that we are the ones incorporating natural design into our design, problem is how do you know there is such thing as ''natural design''?
''Well, the motions of atoms and their subatomic particles are mechanisms that we use inside everything that we design'' No they aren't. We don't use the motions of atoms to create a bottle, at least not on purpose, otherwise you can say you use the motion of atoms doing anything.
The fact is that humans design things, we know that because we can compare them to nature, that's why we say nature is not designed. Everything is filled with flaws, something that you wouldn't expect in a perfect design.