Sentence:  For reasons to do with the predominantly Lutheran rather than Calvinist heritage (and to some extent with the postwar division of Germany which hived off the more <WSD>Protestant</WSD> East), the participation of Protestants in the CDU has been small. 
Meaning of the word marked with <WSD> tags:  Of or pertaining to several denominations of Christianity that separated from the Roman Catholic Church based on theological or political differences during the Reformation.