A question here, based on the fact that I'm not as educated as I would like to be on the subject material, nor remotely as close as some who have made it a life's work, or at least a major part of a degree...

How much evidence is there that the Romans, as a majority of their population, paid more than lip service to their religion? IE, comparatively viewing America today, there is an extraordinary number of non-devout religiously affiliated individuals. Was it so in Rome? Where you pay lip service, such as praising the fates when a merchant deal went well, and not really believe it yourself? Donating a full 15% of your income to a shrine for thanks on a successful venture just as a form of advertising (getting your name bandied about) without actually fully believing the deity/shrine offering had anything to do with it? Err, longwinded I guess, but essentially outwardly portraying religious devotion in accordance with social expectations without actually being a true believer. Was this Rome and their overcharged polytheism that they kept 'adding' to over a couple thousand year period (pre-Etruscan up through Byzantium)?