Quran 98.1-5
Those who disbelieve among the People of the Scripture and the idolaters could not have left off (erring) till the clear proof came unto them, A messenger from Allah, reading purified pages Containing correct scriptures. Nor were the People of the Scripture divided until after the clear proof came unto them. And they are ordered naught else than to serve Allah, keeping religion pure for Him, as men by nature upright, and to establish worship and to pay the poor-due. That is true religion.