This paper aims to show how Kierkegaard’s attack upon Christendom still works today to contrast current forms of conformism disguised under the appearance of new secular religions. I will start with considering Kierkegaard’s concept of conformism as a form of despair. As such, conformism is incompatible with Christianity, as well as with the development of a true Self. Secondly, I will focus on the current religious scene in Western Europe. While Christianity has become a minority in society, new secular religions have arisen and, along with them, new compelling narratives. Mainstream environmentalism appears to be one of these. Finally, I will try to show how Kierkegaard’s arguments against Christendom can be also applied to environmental propaganda.