RacingRodent
Consul
rather paganisms - both traditional Roman and 'barbarian' - weren't the kinds of belief-systems that people died for.
Oh indeed belief systems such as and similar to Jainism, Zoroastrianism, Yezhidism...I mean it is not like anyone died to keep those faiths alive...oh wait...
We cannot accurately gauge numbers because of our distance in time and the fact that the evidence was deliberately suppressed for hundreds of years and it is easy enough to lose large chunks of important data even from the last couple of highly literate centuries but we can assume there were at least some.
All the evidence that is extant indicates that societies in the pre-Christian era were just as pious as those that came later. Therefore there would likely have been martyrs and fanatics (the rule of thumb being ours are martyrs theirs fanatics) on both sides.