What religion believed in monotheism?

Answer 1

the Hebrews, were the first of all known people, to Recognize there was one God Only. Second to them, The Moslem's Recognized there was one god only. Greek Philosophers, likewise presented Valid Arguments for One God, and knowing it could cost them their Very Life to argue such principles, they did indeed pay the consequences. Some believe that the word itself "Religion" is a RE-ference to "Light" and "ION" or Ionism. To include with the Three mentioned, The Christian Religion, would require proof that Christians have a Manifesto they follow, the Hebrews, have the Torah, The Moslem's have the Koran, and Both profess One God, I'm really not certain just what the Christian Religion follows, as far as a Manifesto. The Catholic Religion claims to be the True Christian Religion Via the Pope himself. I'm certain there are other "Mono" religions, but the princible Two, the Hebrew, and the Moslem, are well documented throughout history. I'm Certain someone will add to this, but Please Don't Deleate my post, Add to it if you can, but don't be arrogant thinking or beliving yours is the only answer. Thanks

Answer 2

Judaism is the first recorded religion that believed in monotheism and the first nation is the Hebrews.