I found this info at the link below:
What is Pantheonism?
When the Amorian Emperor Maxoany I saw the popularity and hope that sprang forth from Mordantism, he felt threatened, for the Church was becoming as large, powerful, and important as the Empire. In addition, he had already seen how the Brotherhood of Druids had threatened the early stages of the Empire. Thus, with the help of certain loyal, power-hungry priests, he declared Mordant's ways misguided and ineffectual. Instead, he decreed that the gods should be worshipped individually, each to its own liking.
Maxoany claimed that this method of worship was more to the gods' liking, more likely to awaken them from slumber, and would be a more useful tool against the Deceiver.
There is little doubt that he really wanted to fragment the Church and eventually set its parts competing against one another, thereby solidifying the power of the Empire.
As it turned out, Maxoany did secure the power of the Empire against the Church, for the religion of Pantheonism took hold throughout the Empire and even throughout the world. The reason Pantheonism took hold was because, unwittingly or not, Maxoany's claims seemed to be correct. Pantheonism was a more efficient and effective tapping of the dreams of gods. It allowed priests to specialize and thereby become masters of a single godly aspect. In addition, it allowed these master priests to gain enough familiarity and insight into their god's dreams to mold and shape the gods. Thus was Pantheonism born, and it turned out to be an effective weapon against the Deceiver, while still deferring to the power of the Amorian Emperors.