An ethical person believes in dharma, righteousness, and morality; that is God. If. you are living a life of values, it means that you do believe in those values, is it not so? When can you follow the values of truthfulness and non violence? Only when you believe in the value of doing so; a person can lead a moral life only if morality is important to him. That is enough. He may give it some other name, as he may perhaps not believe in a God who is said to be in heaven. However, as long as morality is important to this person, he does believe in a God that is the moral order itself.