Well there was that intertestamental period when there was no prophet around.
Humanity has never, you’re right, been without God’s guidance, that’s why we have the BIBLE! There’s
only one source of salvation, and that is Jesus, in whom all the fullness of the Godhead dwells bodily
(Colossians 2:9), and no other man. Also, there shall be NO MORE PROPHETS:
God, who, at sundry times and in divers manners, spoke in times past to the fathers by the
prophets, last of all, In these days, hath spoken to us by his Son, whom he hath appointed
heir of all things, by whom also he made the world.