But lots of us can't understand it.
The example of your intelligent mind choosing to pick up a pencil is not a particularly cogent argument for the power of random non-intelligent processes.
How about this: You come to my house and find 10,000 pennies on the driveway, all facing heads up. Then I tell you they got that way by my flipping them out the window.
You express your skepticism about my flippping the coins.
Then I explain: 'You can't argue with it. It's already happened!
The odds of any specific configuration are the same.