Theme of this work represent life and work one of the most famous christian humanist, Erasmus from Rotterdam. We are starting from historical circumstances important for his work and development of his christian philosophy. Philosophy of Christianity or Christ philosophy is a synthesis of theology, spirituality and philosophy. It is divine philosophy which is understandable even for the simplest people. It comes from the heart not only from intelect. This work is structured in 4 parts. First, introductory part deals with historycal time of 15th century, theological and social problems of that time which gave the reason for the development of humanistic thought, and later of the reformation. The second part introduces us to the theme of humanism, its general attitude and its standpoint on Christianity and the Church. The second chapter is also an introduction to the third, which represents Erazmu's life with an emphasis on his love for literature and the Bible from which many works have been created and from which the Christian philosophical system - Christ's philosophy has evolved. The fourth part represents the life and work of Martin Luther before his theological discussion of the free will with Erazmus, followed by a talk of debates itself. Work ends with a talk of humanism and reformation after the debates ceased, but also after the death of Erazmo and Luther. The aim of this work is to demonstrate the humanistic influence on Christianity, its contribution to Christianity, with the emphasis on the work of Erasmus from Rotterdam as a humanist, as well as the influence of Martin Luther as a reformer.