Sentence:  We find it in that `` common way of life pleasing to Christ and still in use among the truest societies of Christians '' , that is , the better monasteries which made it easier to convert the Utopians to <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