Monotheism – The Bible
Deism – Neil Armstrong, the first man to step on the moon, indicated on a NASA form that he was a deist.
Naturalism – Theory of evolution (Charles Darwin & Carl Sagan)
Nihilism – Friedrich Nietzsche, the 19th century German philosopher
Existentialism – Jean Paul Sartre was a key figure in the existentialism philosophical movement, and his work
has had a significant influence on 20th-century sociology, postcolonial theories and general literary studies.
Pantheism – Ethics by Baruch Spinoza