cairo egyptian authorities detain 15 people pending investigation attack unlicensed coptic christian church village south cairo security source say sunday dozens muslims village kafr al-waslin attack church friday prayers smash windows break everything inside archdiocese atfih say statement diocese apply legalize status church house worshippers 15 years church build law pass 2016 statement say detain accuse stir sectarian strife harm national unity destroy private property one judicial source tell reuters owner build also custody pending inquiries operations facility state security interior ministry source add egyptian christians make tenth country almost 95 million population middle east large christian community long complain discrimination majority-muslim country government make official number christians public census christians long complain undercounted muslims object turn build church really big mosque beside one villager ask name tell reuters strong social tie muslims christians village add egypt detain 15 dozens attack coptic church south cairo