In his later years,Engels made an in-depth comparative study between early Christianity and the socialist movement.He believed that there were noteworthy similarities between early Christianity and the socialist movement,but there were also essential differences between them.The purpose of Engels is to complete the summary and reflection of the socialist movement and to point out the way for the future development of the socialist movement.He asserted that socialism would prevail,but the proletariat must win on the battlefield.Engels’s research is still enlightening us.The idea that Engels revised Marx’s revolutionary line into“legal struggle”and“peaceful transition”in his later years is wrong.We should not only face up to the complexity of Christianity,but also properly deal with the relationship between the socialist movement and Christianity.