As you say, it would be difficult, very difficult not to relate the name of her skills with the role of the divine mission she believed in; so it’s a good job the name they gave her.
First because the theme of the hero and skills “in Video Games” consists practically of having ultra-cool names for their techniques, and generally, that it is related to what they did or the theme that was chosen.
In LOL, there was a character based on an anthropomorphic Rat that had an ability called “Ratatatatata” and it was funny, and it made sense with the character who used a crossbow as a machine gun.
The same thing happens here with Joan, she believed that the mission she had in the war was a divine mission, it is good to give her names related to that in her attacks, it makes sense.
Now, most of these abilities are actions that are not outside the game’s suspension of disbelief (Extra attack speed, area damage, economic bonuses to buildings) so they don’t break the game’s immersion.
Of course, if I started summoning meteors or black holes like in Age of Mithology, then I would already be breaking the game’s suspension of disbelief. Of course, I wouldn’t mind if it happened if it was for some joke or temporary event, like the monster event.
In fact, if at some point they bring out a hero, or villain, like let’s say Attila the Hun, if he didn’t come with abilities like “The Scourge of God”, or “The Sword of Mars” I wouldn’t know I was playing. Of course, Attila would be great for a DLC or MOD in the Dark Ages, although it could also be the influence of Attila Total War.