Agnosticism is the view that the existence of God, of the divine or the supernatural is unknown or unknowable. An agnostic can also be one who holds neither of two opposing positions on a topic.
The English biologist Thomas Henry Huxley coined the word agnostic in 1869, and said "It simply means that a man shall not say he knows or believes that which he has no scientific grounds for professing to know or believe." Earlier thinkers, however, had written works that promoted agnostic points of view, such as Sanjaya Belatthaputta, a 5th-century BCE Indian philosopher who expressed agnosticism about any afterlife; and Protagoras, a 5th-century BCE Greek philosopher who expressed agnosticism about the existence of "the gods". The Nasadiya Sukta in the Rigveda is agnostic about the origin of the universe.
According to the philosopher William L. Rowe, "agnosticism is the view that human reason is incapable of providing sufficient rational grounds to justify either the belief that God exists or the belief that God does not exist".
Agnosticism is the doctrine or tenet of agnostics with regard to the existence of anything beyond and behind material phenomena or to knowledge of a First Cause or God, and is not a religion.