I would disagree that Christian saints, even in their most extreme form, are "godlets". At most they might be considered something like the Greek Heros - and after all Judaism, Christianity, and Islam all admit to the existence of created supernatural beings beside the one true God such as angels and demons.
This is an interesting thread and it really does make you think how the spread of Christianity and Islam has perhaps created the common perception that monotheism is a natural evolution of polytheism. Other than Zorastrianism (which is really a dualism, and which itself may have influenced the Abrahamic faiths) and the cult of Aten, I can think of no other monotheistic faith which did not either evolve directly from Christianity (LDS, Deism, etc), or Islam (Baha'i), or evolve as a synchretic movement from a polytheistic, animist, or pantheistic as a result of Chriistian or Moslem influence (Sihkism, the Native American Church, and other synchretisms).
Also, one needs to be very suspicious of 16th Spanish accounts that Mesoamerican religion was either evolving in a monotheistic way, or that the cults of certain gods were monotheistic. After spending 50 years crushing native faiths, the friars and monks then spent another 50 years looking for ways to depict Aztec religion in a more favorable light (sort of like a debased Christianity) - seeking out and highlighting similarities between it and Catholicism.