I think the influence of Christianity historically and at present can be seen in many things. Music, Art, Film, and Literature have all been heavily influenced by Christianity (George Handel, Charles Dickens, William Shakespeare, Michelangelo etc.) If you listen to modern Rock or Metal music, it is full of biblical references and it is the same (but to a lesser degree) with modern film and literature. Non-Christian spirituality (belief in heaven/hell, angels/demons etc.) is influenced by Christianity. Our legal systems have been influenced by Christianity. Many of the words and phrases we use today originate from the Bible. Western morals (monogamy etc.) have been influenced by Christianity and more specifically by Christ's Sermon on the Mount. Even things like architecture and sub-cultures (like Goth's) have been influenced by Christianity.