Who is Immanuel Kant from Marx for Beginners and what is their importance?

Immanuel Kant was a 17th century materialist philosopher. He was also an important influence on Marx's work. Although dead by the time Marx became interested, Kant's theories provided fuel for both Hegel and Marx. He is best known for the "Critique of Pure Reason," in which, he argues that it is scientifically impossible to prove God's existence. In this way, Kant attempts to separate religion from science. He also argues, however, that individuals have to believe that God exists, as there could be no morality without a belief in God.