Theists argue that this is not possible for to deny the existence of God is to take away the moral supports that stop society from falling into moral relativism and nihilism. However, non-theists reject this charge. They point to the morality evident in the world as shown by many that do not profess any belief in God. Kant rejected the possibility of passive reception of knowledge by the mind. Using the moral realm he proceeded to show that humans were not only sense-based creatures but also moral.
Humans have an innate sense of what they 'ought' to do.
There is a 'pressure' placed on humans to act in a moral way. In conjunction with this Kant argued for three transcendental postulates without which morality would flounder. With the first two he argued that moral behaviour is not always rewarded in this life. Kant could be criticised for wishful thinking here. Kant's arguments were used by a number of nineteenth and twentieth century thinkers to support the moral argument for the existence of God.