Because of human nature, monotheists acknowledge one god but worship many idols
That's one way of looking at it, I suppose. The very notion of idolatry was invented by monotheists to poo-poo on other theological perspectives, though, so I don't feel much need to indulge that way of thinking. In any case, it does seem that seeing the sacred in the plural is more of a human default given the difficulty of maintaining strict monotheism in practice. On the other hand, the whole "monotheism vs polytheism" dichotomy is a construct for which one's mileage will vary. I recall a professor in undergrad insightfully describing all theologies as fundamentally both, with the difference being in what is actively worshiped rather than what peoples believe to be sacred. Don't know how much I agree with that, but it was an interesting thought.