In the Imperivm Romanvm all religions are treated as equal, and you are allowed to practice as you wish. However, the state religion is that of the Religio Romana.
The deities of Rome have been long neglected and their once bountiful altars left barren. The time has come to change that. The world is now becoming reacquainted with the ancestral gods of Rome, and it's now your turn to partake.