User blog comment:B214/Volume 22 spoilers/@comment-185.112.105.215-20161011161249/@comment-29963364-20161012214221

Hades dislikes all other religions for the same reason Loki does: They invade their territories by spreading their faith(s).

But he especially hates the Devils and Fallen Angels. The reason for this is that Devils and Fallen Angels are beings that "oppose God(s)" by nature. So being a god, Hades doesn't like beings that "oppose God(s)".

In fact, If he actually turns out to be an antagonist in the next arc, I can imagine him giving a ranting speech about how "Devils and Fallen Angels are abominations that defy the gods and should be eliminated."