Deviance, yes shying away from what is "proper". How did the Romans view religious deviance?
Now we must always remember the CDR is about freedom. It is central to its practice. The Gods are free to favor and do what they please. Similarly, mortals are free to ignore or appeal to the Gods. The relationship is not one of coercion or one made under the threat of divine wrath.
So is there such thing as religious deviance in the CDR? Yes and no.
Our ancestors, the Romans of antiquity came up with traditions that through trial and error and divine inspiration became known to honor the Gods. This system was not rigid as earlier scholars proposed. But it was conservative and cautious.
There were right and wrong ways of doing things. Where you risking hell fire for doing things wrong? No. But you are potentially ignoring a known "best and proven" way of honoring the Gods. What that means to you is up to the person. Again you are free.
Cicero wrote about this. Below is a passage from his De legibus, written in 51 BCE. Here the classic orator speaks about the proper way of doing things in the CDR.