Fundamental to Kant's philosophy is his conception of how human knowledge is acquired. He argues that it is our sense experience that provides the data from which the rational structure of the mind then organizes into connecting complexes of cause and effect.
In The Critique of Pure Reason, Kant argues that it is impossible to have any knowledge of things that lays beyond our sense experience; it is, therefore, impossible to have any real knowledge and, as a result, any cognitive basis, for a belief in God. Such concepts as God, right and wrong, etc, are, he says in his next work (Critique of Practical Reason) simply practical necessities without which human society cannot function. In essence, Kant turned religion into a matter of ethics.
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