Temples from RTW into BI

[SkyShadowing]

I want to make it so all the Roman Pagan temples from Rome: Total War can also be built by the Romans in BI. Can anyone tell me how I would go upon doing this? In case you wanted to know, I didn't like it how Christianity was set as better than Paganism, I want to give the player choices in what religion to build, and wanted all the old gods temples to be built, not just Sol Invictus and Mithras.I want all levels, from Shrine to Pantheon, if possible.

[Squid]

Here's a link to a tutorial for adding buildings to the campagin.