Elijah (who, unlike Moses, is probably a real historical figure) lived long after the events depicted in Exodus. And Exodus ends with the all of the Israelites faithfully following Yahweh's commandments, after narrowly avoiding death for their worship of the golden bull idol. The book of Kings presents a time long after that, when the people of the now divided Israel have lost their way and started worshiping Baal - as opposed to their ancestors who only worshiped Yahweh.