Sentence:  What that spirit and attitude were we can best understand if we see more precisely how it contrasts with the communist tradition with the longest continuous history , the one which reached <WSD>Christianity</WSD> by the way of Stoicism through the Church Fathers of Late Antiquity . 
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