Jehovah’s Witness publications define apostasy as the abandonment of the worship and service of God, constituting rebellion against God, or rejecting “Jehovah’s organization”.
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Bertrand Russell (Wikipedia)Bertrand Arthur William Russell, 3rd Earl Russell, OM, FRS (18 May 1872 – 2 February 1970) was a British mathematician, philosopher, logician, and public intellectual. He had a considerable influence on mathematics, logic, set theory, linguistics, artificial intelligence, cognitive science, computer science and various areas of analytic philosophy, especially philosophy of mathematics, philosophy of language, epistemology, and metaphysics.