Also, mind that the game takes place right after the events of Descent into Avernus; wherein also there are cults to the Dead Three. Now, I doubt we'll be facing a deity [/quote]
Now, I doubt we'll be facing a deity, or a trio directly,
Icewind Dale: Rime of Frostmaiden puts the players directly up against a deity, and it covers a similar level range to BG3 (1 to 10+).
It might be significant the the plot of that adventure involves the recovery of Netherise magic, and takes place before Decent to Avernus, and hence before BG3.