I agree with PSacramwnto. There's many references in the NT of women who were key supporters of the early christian movement. Some were like patrons and some were loved very much for the charitable things they did like Dorcas in Acts. (Acts may be fiction but Dorcas is very likely a composite of early christian women and what they did for others.)
Stark's argument about the birth rate differential between christian and non christian populations works equally well if applied to the present situation of muslim immigrants in europe. Some europeans nowadays are a bit concerned over that. What shouldn't be discounted though is how the group acts to its own members and to others. Again early christians were noted for their help of the underprivileged and sick. That they were growing in numbers wasn't all that worrisome.