"Have a look at your computer. Did it arrive by random chance or did some one design it? Your motor car. The cake you eat. Random chance? Big bang? Or did some one sit down and design, experiment until it all got to what you see?"
Evolution.
Usable home type computers started off as basic things with blocky graphics. Over time they got better and better. Sometimes a new branch would develop, like games consoles, which would evolve off in their own ways. Sometimes there would be an evolutionary dead end, such as the MSX revolution. (MSX? Exactly!).
From our common ancestor evolved us, chimps, orangs, and gorillas.
From the ZX80 evolved the laptop, the console, the desktop, and most recently, the tablet.
Same with cars. Every year the designs get a little bit better and more advanced.
The cake we eat? Mmmmmm. Mince pies. Mincemeat used to have real meat in but as the recipe went on it was dropped. Used to be just for Winterval too but that's changed slowly over time for the better.
By "Or did some one sit down and design, experiment until it all got to what you see" , do you mean there were lots of little changes, each improving on the last, with dead ends forgotten, until you arrive at what you have now which will be in turn improved upon in the future?
You do realise that you're arguing in favour of evolution don't you?