Well Suka and Dia probably. To ideally answer, Suka is a priestess and Dia serves a deity. If you are then so are both Aku and Suka as well, but Aku and Dia can't be at the same time, so Suka can only be a priestess while Dia is but Aku isn't. Leaves two. Hmm no, point 3.
Well, according to the puzzle, there’s four of you and it’s Dia who serves the deity since she’s the only one who was mentioned that was possibly serving a deity...
There seems to be multiple answers that fit the provided logical statements, so I believe that the puzzle is flawed. Mostly revolves on Aku: Aku is a Priestess --> 1,2,4 valid, 3 not applicable, so everyone is a priestess and Dia serves a diety Aku is not a priestess --> 1, 4 not applicable, 3 makes you a priestess, and Suka can do whatever they want That makes at least 3 variations that fit all the logical statements Note: assume priestess serves deity.... kind of in the definition
If you aren’t a priestess, then Aku is, but if Aku is a priestess, so are you. It wouldn’t make sense if you weren’t, so you must both be priestess..es.. and thus so is Suka. So you, Aku and Suka are priestess..es. Since both Aku and Suka are priestess..es.., Dia “serves a diety.” So to answer your question, if priestess..es.. serve dieties, then you all do. If not, then only Dia does.
Suka is a bitch and priestess. Dia serves a deity as a bitch but not as a priestess. You and Aku aren't priestesses neither. Note: suka in Russian means "bitch", I learned from online gamers. Cthulhu doesn't care and will eat you anyway. Now join Cthulhu cult and worship him so you'll be eaten first when he arrives!
You failed as a Puzzle "Host", since you aren't giving out Clear Hints from the Puzzle so we can't make a Clear Answer for that Puzzle. Especially "how many of us and which of us serve a deity?", meaning you are asking people how many priestesses are there and which among them serve a deity. But from your clue, we can try to guess the number of priestess from the puzzle, but the question of "which of us serve a deity?" then you already gave out the answer being Dia, with no one else being mention of anything like that. And also, in your clues, you didn't mention about Dia being a "priestess" meaning being a priestess doesn't mean you serve a deity, so even while the random number of "priestess", there is only 1 person among them serve a deity, and not even being a priestess, being "Dia"..... You need to give out Clear Clues, Puzzles, and just 1 Clear Answer if you are trying to make a good Puzzle. If a Puzzle has more than 1 clear answer, then that's just a bad puzzle.
You could very well be the only priestess around, there are too many possibilities depending on where you start.
I love how everyone is acting logically but being stumped by the unclear wording of the puzzle itself
There is more than one possibility and it's impossible to be sure of one. The rules: Rule 1: There has to be at least 1 priestess. Rule 2: If Aku serves a deity them all of you serve a deity. possibilities: 1 of you serve a deity: You. 2 of you serve a deity: You and Dia. You and Suka. 4 of you serve a deity: You, Aku, Suka and Dia.