What did Nietzsche mean by the expression “God is dead”?

What did Nietzsche mean by the expression “God is dead”? “God is dead” (German: “Gott ist tot”) is probably the most famous and notorious statement of 19th-century German philosopher Friedrich Nietzsche. This sentence appears for the first time in his book “The cheerful science” under aphorisms 108 (“New wrestles”) and 125 (“The fool“), and a…