Found it very weird to find no guide on this for RTW, just for BI. Thus I post this. If I'm wrong I really couldn't find anything in the scriptorium.

How do we make paticular gods available to honour for certain factions? I add to the list of factions available to build. Lets say I made the Scipii capable of building the temples of farming. All I know what to do is add it to the top thread of each building { romans_scipii, faction, faction, } for example. And we go to Export_Buildings in the Text folder and I copy the Demeter section over all the roman sections and I change it from greek to roman. It don't work.

Also I'm trying to get the temple of trade for the Thracians and the temple of Naval for all the roman factions.

What am I not doin or doin wrong?