Church as we use the word refers to all religious institutions,________they Christian, Islamic, Buddhist, Jewish, and so on.
句意：我们使用教会这个词来指称所有宗教机构，无论是基督教、伊斯兰教、佛教还是犹太教等等。be they...等同于no matter whether they are...为固定用法，引导让步状语从句。