Albert Camus was a French Algerian author, philosopher, and journalist who was awarded the Nobel Prize for Literature in 1957. He was a key philosopher of the 20th century, with his most famous work being the novel The Stranger. 
The following is from the an article from the Internet Encyclopedia of Philosophy:
"Christian images, symbols, and allusions abound in all his work (probably more so than in the writing of any other avowed atheist in modern literature)..." 
"It should be noted that during this period, Camus strongly declared himself an atheist. However, he was so strongly influenced by St. Augustine's writings, that when Camus came out with his own work, "Christian Metaphysics and Neoplatonism", he "ultimately combined the idea of the absence of God with the concept of a natural longing for salvation and meaning that only God can provide. This paradoxical situation would define the ‘absurd’ character of existence and inform all of Camus future writing."