In 1997, Sergei Loesov suggested the theory of the ‘Non-Emergence of Christianity from Judaism’. It stressed the break of tradition between Early Judaism and the earliest form of Christianity and assumed the appropriation of the Jewish elements into the non-Jewish context, rather than uninterrupted line of transmission between the two. This theory was largely overlooked, but in the light of the later development it deserves proper attention, albeit not without certain corrections. This theory implies the existence of a ‘buffer zone’ that was not defined by Loesov, but the present writer suggests to look at the earliest form of Christian ritual and hymnography as a possible buffer zone. It is important that thisidentification of ‘buffer zone’ satisfactorily explains the mechanism of alterations within oral traditions as well.