Are you serious with this bro? When did people actually prove that God exists and therefore started fighting islam? No religion has more proof that their God exists anymore than any other religion. Its all based on faith and how you were raised or what religion fits your own belief system the best, so you follow it, if you are so inclined. Youre also talking about the media and how they introduced everyone to atheism and that is not true. Atheism has been around as long as religion, its just not been out in the open as much due to intolerance and prejudicial thinking. The media operates on profit motive first and foremost, and will not adopt or endorse any religion because its bad for business. They sure as hell wont promote islam either.
As far as a president being a non believer, the reason its never happened is simple statistics. The vast majority of people in this country identify with some sort of religion, be it right or wrong, so the chances of any given president not having a religion is very small, so it simply hasnt happened.
And youve got to be fucking kidding me with thinking islam will make everyone equal. Try going to an Islamic nation and tell people youre gay, or dont believe in Mohammed, or a million other things that you can do in America and let me know how that works for you.