Bertrand Russell 
Free Thought and Official Propaganda [EPUB ebook] 

Let us begin by trying to be clear as to what we mean by “free thought.” This expression has two senses. In its narrower sense it means thought which does not accept the dogmas of traditional religion. In this sense a man is a “free thinker” if he is not a Christian or a Mussulman or a Buddhist or a Shintoist or a member of any of the other bodies of men who accept some inherited orthodoxy. In Christian countries a man is called a “free thinker” if he does not decidedly believe in God, though this would not suffice to make a man a “free thinker” in a Buddhist country.
I do not wish to minimize the importance of free thought in this sense. I am myself a dissenter from all known religions, and I hope that every kind of religious belief will die out. I do not believe that, on the balance, religious belief has been a force for good. Although I am prepared to admit that in certain times and places it has had some good effects, I regard it as belonging to the infancy of human reason, and to a stage of development which we are now outgrowing…