Marcion of Sinope, as the vast output of books and papers about this second century teacher has proven since the times when he was alive and still until today, is one of the most known and debated Christian entrepreneurs of the new religious Jesus-movement, perhaps the one who was responsible for the self-denomination 'Christianity'. In this volume papers have been collected that originated or were inspired by a workshop in 2014 at the Max-Weber-Kolleg, University of Erfurt, directed by Jan Bremmer, Jorg Rupke and Markus Vinzent. 'Marcion of Sinope as Religious Entrepreneur' is not just a volume on Marcion's texts, but also on his role and his reception in the second century, particularly in the making of Christianity.