This study examines the criticism of Christianity expressed by Friedrich Nietzsche and Soren Kierkegaard, particularly in relation to the question of moral action. These author's work were both published in the 19th Century. To analyze their written works, a hermeneutic approach is assumed. The Concepts pf slave morality, nihilism, and the disticntion between Christendom and Christianity are emphasized in the previous research and are here used analytically to contrast the author's works. The results of the study reveals both clear similarities and differences between Nietzsche and Kierkegaard's thought. The main difference lies in their views on the Church as an institutional doctrine and the impact of western moral principles on divine and human reason. The main similaraity is the emphasis both authors place on the individual's free will. The analysis also highlights the problematic nature of prevailing principles and the Christian image of God in the author's works. The concept of free will is seen as most central to their arguments, partilcarly in relation to wheter mankind's deire for the Christian God is rational or not. In conclusion to the result, the study also discusses the implications pf the study for teaching about philosophy of religion in the classroom. Therefore, a discussion regarding didactics is held to suggest how this subject matter could be utilized in a teaching context, espacially to encourage critical thinking and reflection.