This paper seeks to examine the difference between T. S. Eliot and Robert Lowell in terms of their attituds toward Christian belief and the Christian way of life. The former was born into a Unitarian family, and the latter into a well-known Boston Brahmin family. Neither was satisfied with his family religion and his ancestors`` practice of Christianity. For example, T. S. Eliot converted to the Church of England because he believed that Unitarianism is not good enough to redeem modern society and people; also, Robert Lowell was in severe friction with his Puritan ancestors all throughout his life. After his conversion to the Church of England, T. S. Eliot thought that modern society and its citizens could be cured from their modern malady through the recovery of Christianity. For example, in "Ash-Wednesday", the speaker says that even if he is in frustration, he is able to come close to God. However, Robert Lowell converted to Catholicism because of his conflict with ancestors whose religious attitude and practices he found abominable. In the long run, he also left behind the Catholic church. His poetic journey from Lord Weary`s Castle to Life Studies is not only a record of his resistance against his family religion, Puritanism, but also an expression of his discontents toward the Christian way of life. Yet their attitudes to Christianity were totally different: Eliot believed in the possibility of Christianity in terms of its redemption of modern society which, he strongly believed, was in complete corruption; but Lowell ultimately denied Christianity itself.