When guests are coming for dinner, we sweep and vacuum the floors, make sure the bathrooms are presentable and beds are made. If we haven’t had time to fold the clean clothes on the quest bed, we close the door.
But with God, we can never close a door so that he cannot see what we have been doing or need to do. The Holy Spirit tells us to get rid of the dirty clothes called “fornication, uncleanness, passion, evil desire, and covetousness.”
He calls these acts idolatry because we choose to do them even though we know God is displeased with these. Anything we value more than God is an idol.