Read this: The German materialist and atheist anthropologist Ludwig Feuerbach would signal a new turn in materialism through his book, The Essence of Christianity (1841), which provided a humanist account of religion as the outward projection of man's inward nature. Feuerbach's materialism would later heavily influence Karl Marx.

When did Ludwig Feuerbach die? 
What is the answer? (If it cannot be answered, return "unanswerable")
unanswerable