'O God' in the Bible

Hath a nation changed their gods, which are yet no gods? but my people have changed their glory for that which doth not profit.

How shall I pardon thee for this? thy children have forsaken me, and sworn by them that are no gods: when I had fed them to the full, then they committed adultery, and assembled themselves by troops in the harlots' houses.

Shall a man make gods to himself, and they are no gods?