Sentence:  While it must be said that these same Protestants have built <WSD>some</WSD> new churches during this period , and that religious population shifts have emptied churches , a principal reason for this phenomenon of redundancy is that fewer Protestants are going to church . 
Meaning of the word marked with <WSD> tags:  quantifier; used with either mass nouns or plural count nouns to indicate an unspecified number or quantity