How can you? Would you stop working if you knew there was someone or something that would care for all you and all your needs and allow you to live the life that you want to without any hardships? I know I would. If God did prove he was real and everyone believed that he was always there for us, there would be no need for caring for yourself or having a will of your own if you had your whole life safely set out before you in a way that you would like it. At the other end of things, if no one believed in any divine or other being that wasn't mortal, why would we still be kind to each other each day and not always trying to take what others had be it property, a spouse or their life? Just think on this for a second. What would be the point of doing good without a God, and the point of doing anything with a God?