Endsjø research focuses on the continuity between traditional Greek and early Christian beliefs, on sex and religion, religion and human rights, and religion and popular culture. In his book Greek Resurrection Beliefs and the Success of Christianity, he demonstrated how Christian resurrection beliefs also connects to ancient Greek beliefs in resurrection and physical immortality. The book Primordial Landscapes, Incorruptible Bodies deals with the continuity of geography, asceticism, immortality between traditional Greek and early Christian worldviews. Of his other books, Sex and Religion: Teachings and Taboos in the History of World Faiths has been published in eleven languages: Bulgarian, Chinese, English, Italian, Macedonian, Norwegian, Polish, Portuguese, Serbian,, Swedish., and Ukrainian, while The History of Immortality is published in Norwegian and Latvian. Endsjø has published various texts on religion and human rights, religion and popular culture, and the cultural understanding of space in ancient Greek religion. He writes on a variety of political and popularized subjects in Norwegian media. As an expert on human rights, Endsjø also contributed to change the Norwegian equal rights legislation more in accordance with international human rights, as well as the national debate on equal rights into a general discussion of human rights. He is also the designer of the coat of arms of Fjord Municipality in Møre og Romsdal.
Books
Udødelighetens historie. Fra Jesus’ oppstandelse til zombier, antioksidanter og barn i ilden. Oslo: Cappelen Damm 2016. Also published in Latvian.
Sex and Religion: Teachings and Taboos in the History of World Faiths. London: Reaktion Books 2011.. This book is also published in Bulgarian, Chinese, Italian, Macedonian, Norwegian, Polish, Portuguese, Serbian, Swedish and Ukrainian.
Det folk vil ha. Religion og populærkultur . Oslo: Universitetsforlaget 2011.
Greek Resurrection Beliefs and the Success of Christianity. New York: Palgrave Macmillan 2009.
Primordial Landscapes, Incorruptible Bodies. New York: Peter Lang 2008.
Naturlig sex. Seksualitet og kjønn i den kristne antikken. Oslo: Gyldendal Akademisk 2002.
Lei av kjønn? Nær-kjønn-opplevelser og andre beretninger fra virkeligheten. Oslo: Cappelen Akademisk Forlag 2001.
Other publications (selection)
. Journal for the Study of the New Testament, vol. 30, 2008: 417-36.