When one of your units joins the Infernals or the Mercurians in the afterlife, the message appears before the battle animation finishes, which gives away the result of the battle.
There are a number of errors in the civilopedia religion entries.
Ashen Veil:
Demons Altar should be Demons' Altar.
Diseased Corpse should be Diseased Corpses.
Council of Esus:
There is no list, which means that the Nightwatch, who are the religion's most important unit, aren't even mentioned.
Shadowrider[/LINK] should be Shadowrider.
Empyrean:
"Founder receives a Ecclesiastic" should be "Founder receives an Ecclesiastic".
Fellowship of Leaves:
The description talks about Elven Archers who are no longer in the game.
Octopus Overlords:
Slavery no longer Octopus Overlords as a state religion, so it should not be on the list.
Order
"Founder receives a Acolyte" should be "Founder receives an Acolyte".
Runes of Kilmorph:
No errors as of 0.41j.
This may not be an actual error, but the civilopedia religion entries make no mention of temples, which have varying effects between religions, or high priests, who can be quite important in the late game.