Oh no.
Here's what I did to test, first with a Dom-10 god:
Turn 1: Teleported (gate stone) a priest (not a prophet) to the 2-province "island"
dom in island (after running turn): 0
Turn 2: Build a temple in province, teleport 8 slaves to the province
dom in island: 0
Turn 3: Sacrifice 1 slave
dom in island: 2! Gah. That's impossible, supposedly.
Turn 4: Sacrifice 1 slave
dom in island: 4 (+2 again!) But this time I saved the turn before running it, so I've got evidence.
Turn 5: Sacrifice 1 slave (H1 priest this time, before it was an H4)
dom in island: 6.
Well, that's just goofy. Every turn I've sacrificed, I'm getting +2 candles in the island. EA Mictlan temples are not supposed to spread dominion, right? I will take a turn off sacrificing and see if I get dom spread. I'm running CBM1.5, but that shouldn't make a difference.
Turn 6: No sacrifice.
And ... 6 candles. No change.
Turn 7: No sacrifice.
And ... 6 candles. No change. I'll go back to sacrificing, 1 virgin:
Turn 8: 1 sacrifice.
And ... 8 candles. Well, that's enough of that. I'll sacrifice 4 slaves at the temple with an H4 priest.
Turn 9: 4 sacrifices.
And ... 17 candles. +8. Plus I got a "festival" event for +1. Stupid events!
I'll test with a starting dom of 9 and no extra temples next, then 5 and no temples. then 5 and 25 temples.