[gman992]

Yes, and there was a time when atheists fed Christians to the lions...And I don't even talk about what the Jews are doing to the Muslims!

[VOA]

...there was a time when atheists fed Christians to the lions...

By and large, the Romans feeding Christians to lions (and other creatures)
were polytheistic.

I've heard some church historians say that the average Roman might
accept that the Christians were leading exemplary lives...but why
couldn't these weirdos accept that there were a multiplicity of
gods and Caesar was also a god?

To those Romans, the Christians just didn't have enough religion (or gods).