According to the article I linked, it seems to be due, in part, to aggressive proselytizing. But also possibly due to (in no particular order): Christians having more pro-social values than alternative belief systems at the time, those pro-social values resulting in better plague survivability, or their pro-natalist stances. There are all sorts of possibilities, and it is quite interesting. But Christians before the time of Christian Rome were certainly not out conquoring other people - at least not at scale. They weren’t that powerful.
Sure, but other religions do this too?
According to the article I linked, it seems to be due, in part, to aggressive proselytizing. But also possibly due to (in no particular order): Christians having more pro-social values than alternative belief systems at the time, those pro-social values resulting in better plague survivability, or their pro-natalist stances. There are all sorts of possibilities, and it is quite interesting. But Christians before the time of Christian Rome were certainly not out conquoring other people - at least not at scale. They weren’t that powerful.