There was also the problem of identity, in the Roman's normative religions, political and ethnic units were the focus for public religious activity ( private religious belief did not take precendence to public cults.) That was one of the reasons some religions were regarded with suspicion ie Christianity, worshippers of Bacchus etc. These religions (and we could add more to the list) cut the normal Roman connection of civic and religious identity. However, that does not add to the orginal post, sorry.