I dunno how christians behave online
I lived in a christian place and it was alright, noone talked about god besides in the context of going to church (which is a more social activity than anything else)

Now I live in a muslim place, and islam is more penetrative to daily life in sense you see occasional hijabis, there is a call to prayer, there is an unwritten rule to not eat where fasting people could see you through ramadan... But as with all cities, one can keep on with their life just fine while being completely detached from the society he lives in ( ´ω`)