Dennett is an atheist and secularist, a member of the Secular Coalition for America advisory board, and a member of the Committee for Skeptical Inquiry, as well as an outspoken supporter of the Brights movement. Dennett is referred to as one of the “Four Horsemen of New Atheism”, along with Richard Dawkins, Sam Harris, and the late Christopher Hitchens.
Russell claimed that beginning at age 15, he spent considerable time thinking about the validity of Christian religious dogma, which he found very unconvincing. At this age, he came to the conclusion that there is no free will and, two years later, that there is no life after death. Finally, at the age of 18, after reading Mill’s “Autobiography”, he abandoned the “First Cause” argument and became an atheist.
Harris has been referred to, along with Daniel Dennett, Richard Dawkins, and Christopher Hitchens, as one of the “new atheists”, but he considers the term “atheist” to be problematic. He said, “while I am now one of the public voices of atheism, I never thought of myself as an atheist before being inducted to speak as one […] I think that ‘atheist’ is a term that we do not need, in the same way that we don’t need a word for someone who rejects astrology.”
Marx was an atheist from his childhood and remained such for the whole of the rest of his life.
His atheism was not only practical but also theoretical. His theoretical atheism is due primarily to philosophical reasons and only secondarily to historical, social and political reasons.
Already in his thesis for the doctorate Marx proclaims in no uncertain terms that “in the country of reason” the existence of God cannot have any meaning.