Sentence:  Although they have also been concerned to stand squarely within the tradition of the apostolic church , they have exhibited no willingness whatever to sacrifice their modernity to their <WSD>Christianity</WSD> . 
Meaning of the word marked with <WSD> tags:  a monotheistic system of beliefs and practices based on the Old Testament and the teachings of Jesus as embodied in the New Testament and emphasizing the role of Jesus as savior