Some religions could be considered polytheism in disguise, like Catholicism. The Catholic encyclopedia states:
- "In the unity of the Godhead there are three Persons, the Father, the Son and the Holy Spirit, these three persons being truly dfistinct from one another. Thus in the words of the Athanisian Creed: 'the Father is God, the Son is God and the Holy spirit is God'."
It however, then goes on to say that this does not mean there are three Gods, and does not bother to explain this.
Also, religions like Hinduism are actually examples of monotheism since there is only one god. Lord Brahma the creator, Lord Shiva the destroyer, Goddess Laxmi, Lord Ganesh and all the hundreds of others are all just different incarnation of the one god.