In his newest book, Dominion: The Making of the Western Mind, atheist Tom Holland, who is not a follower of Jesus Christ, claims the morals of the western world would not exist without Christianity. This is a really interesting read, especially coming from a historian of such repute, yet not a Christian.
For more interesting reading, just enter Tom Holland Atheist Historian in your search engine and find gems like this: https://www.newstatesman.com/politics/religion/2016/09/tom-holland-why-i-was-wrong-about-christianity.