Sentence:  Here , for the most part , they were well treated , as a `` reminder of the Old Testament heritage of <WSD>Christianity</WSD> '' ; many of their gifted members were prominent in the Vatican as physicians , musicians , bankers . 
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