User blog comment:B214/Question and Answers 6/@comment-36.72.199.46-20161213181208/@comment-29963364-20161214154231

The other Factions (Norse, Egyptian, Shinto, etc.) didn't like the idea of peace with the Three Great Factions because during the Great War, the Devils, Angels and Fallen Angels tried to get an advantage against each other by gaining influence among more humans, leading into the "expansion of Christianity" throughout the rest of the World.

The reason Loki didn't approve of Odin agreeing to an aliance was because the Christian Faction was spreading their religion on their soil, weakening their religion as a result.