trading posts, lumber mills, forts (do these remove forest or go on it? unconfirmed by me either way), anything that removes the forest, any great person tile (also haven't confirmed) will mess it up.
I've just played as the Celts to determine this; built roads in every single tile around the city - including those not adjacent but in the city perimeter - and the faith was NOT affected.
I have exactly 3 forests next to Edinburgh, 1 has a road, the other two have nothing. City is still making +2 faith from Traits. Roads do not count as an improvement with regard to the Celtic UA.
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