It's interesting how you phrased your question, but if mankind was finally able to prove whether or not there is a higher power, I don't really think much would change. Life would still go on. People would still have problems. I spend a lot of time wondering whether there is something else, but truthfully it doesn't really matter. How would things be different is we knew for a fact that we are the only life in the universe? How would things be different if we knew for sure that the Yeti wasn't real? How would life be different if someone found a dinosaur in Loch Ness? There would be a headline in the paper, you would read it and say isn't that cool, then you would go to work, same as always. You seem to know for sure that there is no higher power in the universe. Since you know this, from your perspective it's true. How is your life different from the next guy who knows that such a thing does exist? You both go to work, meet people, go to the mall, eat dinner at the same time of day, you both drive your car to the store to get groceries. If someone you loved was in danger you would both try to help them. So how would life be different if tommorrow someone proves that there is no god? The same as today I say.