All fair. I suppose I've got quite a low-resolution view of Church history - to my mind, 'Early Christianity' is (roughly) everything up to about 1054, and you're absolutely right that generalising over such a long period is a dangerous game. With that said, there's a lot of Christian artwork from throughout the Roman period, isn't there? If not statues, I can at least think of several mosaics and sarcophagi with explicitly Christian symbols and stories from reasonably early (3rd century or so) in the Roman period, and I'm fairly sure that they've found Christian ritual objects from the 1st century in Italy.
What sort of proportion of Christians, do you think, would have been attending these daily groups?
What sort of proportion of Christians, do you think, would have been attending these daily groups?