Congratulations! You've added Atheism to the ever growing list of modern religions! It joins its esteemed colleagues Global Warming and Evolution as the most modern religions on the planet.
Listen, you can believe that there is no higher power. You can debate with your friends about it. However, once you start trying to convert people to your viewpoint, it's no longer that you don't believe in a higher power, it's that you BELIEVE in not believing in a higher power. Then you're just another religion trying to convince all the other religions that they are wrong. Remember all those religious wackjobs you thought so little of? Yeah, you're one of them now.