You must be true to your self and believe in your own power of thinking. Does an animal have a God? Does an animal need one? We are thinking animals and we do not need an invisible "being" in the sky. We need the power of our own brains, and that is the truth.
If someone is trying to sell you on "heaven" or "hell" to get you to believe in something, well, just think about it. You have to die to achieve either one, so they are just messing with your brain.