What is 'proof'? Its a word we created to give us power over the universe. If you have proof then you can obviously explain the essense of something, right? But what do you base the explanation on?
How do you know your proof is correct? Because a group of scientists said so? What makes them absolutely right? Granted, they make a lot of sense and I really have no reason to question their findings, but what if theyre wrong? What if it really is Gods will that keeps us planted on the ground? And what if Gods will can be described with manmade ideas like mass and pressure combined with the rotation of the planet?
I'm not saying science has it all wrong, maybe theres just other ways to describe the world around us. People shouldnt get stuck on one discipline or belief, whether scientific or religious. Minds should be open to the possibility that factions other than their own have a piece of the puzzle.
Theories need to be corroborated by other scientists before being taken as proven, right? The only problem is that theres no way to prove all the foundations of our own knowledge. If we could meet a society from another galaxy that used the same methods we did and explained the universe in the same way, it would 'prove' something to me. Otherwise, its all stuff we've made up. Really good stuff from really intelligent minds, but made up nonetheless.
As to why we evolved from monkeys, but theres still monkeys around, I'd say its like this:
Say you got a bunch of monkeys. After generations of breeding, 50% of those monkeys' descendants gain more useful opposable thumbs, so they can better interact with their surroundings. Later, 50% of those monkeys gain better eyesight so they can gather food and watch for predators. Later still, 50% begin walking upright. Pretty soon you got humans. Since half of the monkeys never evolved and kept breeding though, you also still have a lot of monkeys.
I guess there wasn't much wrong with monkeys in the first place, or they would have died out. What a sad world it would be then, because monkeys are funny, especially when they wear human clothes and walk little dogs and stuff.