I too cannot decipher the message... except maybe for a part of it. The question I find is interesting:
How will be the relations between different fantasy priesthoods?
If the priesthoods have opposing gods, see each other as evil, and consider it their duty to erase the other, well, then it is clear. A more or less open holy war is to be expected.
But what about priesthoods with not so clearly defined goals?
Historically, we know of many conflicts of priesthoods of the _same_ god (read The Name Of The Rose for a good intro, as well as a nice story). Religion and politics produced violent clashes, up to armies clashing for differences on how to read the Bible.
But this is fantasy. The priests, having their supporters, often have significant magical powers. In some high-magic worlds the High Priests end having the potential of tactical nuclear weapons. And the likely opponent can have these powers, too. In other worlds a Priest can at least (in theory) ask for the god's assistance... which is a worthy argument, too.
So what is likely be the relation between non-opposing priesthoods? What will the priests say about the others, to not provoke a holy war? I guess, in the end, it will be something like "Oh, they are quite fine, those spartans, nothing wrong about them. But you are right, their teachings are good for _some_ people only. Come join us!".