As the Romans extended their dominance throughout the Mediterranean world, their policy in general was to absorb the deities and cults of other peoples rather than try to eradicate them,  since they believed that preserving tradition promoted social stability.
Second, every Christian considered themselves equal to every other Christian. Often, an emperor would request his predecessor to be deified. The Rise of Christianity in the Roman Empire Emperor worship would continue until late in the western Empire until the reign of Constantine.
He had priestly duties to his laresdomestic penatesancestral Genius and any other deities with whom he or his family held an interdependent relationship.
The first "outsider" Etruscan king, Lucius Tarquinius Priscusfounded a Capitoline temple to the triad Jupiter, Juno and Minerva which served as the model for the highest official cult throughout the Roman world.
Romans also had a set of public gods, such as Jupiter and Mars.
Roman religion laid almost exclusive emphasis on cult acts, endowing them with all the sanctity of patriotic tradition.