He very well could reveal Himself, but God doesn't want robots. He wants beings that can think for themselves and choose to follow him. Whether you believe in God or not is your business. If you're an atheist, I'll just say this: "If you're right about God and religion, we will both die and go into the ground. I'll have enjoyed my life, and hopefully you will have enjoyed yours. HOWEVER, if I am correct and you are not, I'll be perfectly happy for eternity while you regret your decisions for the same length of time."