For which we're truly grateful.

[This is very obvious sarcasm. Erk rolls his eyes, and sighs again.]

Fine, since we're already this far into a discussion...

[He counts off his answers on his fingers:]

I have never said "oh my god", and have no plans to start. If one of the new gods said it, I would assume they were referring to whichever god they worshiped before becoming one. A shinki should call their god by whichever name their god prefers. If one's vessel form is... particularly unfortunate, that shinki should find other ways of being useful. And I see no reason why a god could not pray to another god, seeing as each has their own specific dominion.