Christianity was created around 30 ad. What Jesus preached was christianity, however back then it was called 'The Way' Up until then the Jews, Gods chosen people, were a part of judiasm which is what the Old Testament preaches. Once Jesus sacrificed himself for us it changed so that we no longer needed to give sacrifices. Which became the New Testament.
Atheism in Christianity was created in 1972.
The Essence of Christianity was created in 1841.
Introduction to Christianity was created in 1968.
Sum of Christianity was created in 1536.
Mere Christianity was created in 1952.
Practice in Christianity was created in 1850.
Foundations of Christianity was created in 1908.
Center for Progressive Christianity was created in 1996.
Studies in World Christianity was created in 1995.
Society for the Study of Early Christianity was created in 1987.
A New Christianity for a New World was created in 2002.
An Argument Against Abolishing Christianity was created in 1708.