I did a search, but 'wish' and 'dominion' show up in an awful lot of threads
None of them seem to be what I want, though.
I don't see any difference when I wish for dominion... The province I was in was at -9 on the turn before, and still at -9 after. I didn't -notice- a change in any provinces where I had positive dominion either, though I wasn't really looking for it there.
Given the message about '... at the expense of all the other pretender gods.', I would expect to gain ground in negative dominion provinces.
Am I completely misunderstanding what a wish for 'dominion' is supposed to do?