The Council of Jerusalem is generally dated to 48 AD, roughly 15 to 25 years after the crucifixion of Jesus, between 26 and 36 AD. Acts 15 and Galatians 2 both suggest that the meeting was called to debate whether or not male Gentiles who were converting to become followers of Jesus were required to become circumcised; circumcision was considered repulsive during the period of Hellenization of the Eastern Mediterranean.
At the time, most followers of Jesus (which historians refer to as Jewish Christians) were Jewish by birth and even converts would have considered the early Christians as a part of Judaism. According to Alister McGrath, the Jewish Christians affirmed every aspect of the then contemporary Second Temple Judaism with the addition of the belief that Jesus was the Messiah. Unless males were circumcised, they could not be God's People. The meeting was called to decide whether circumcision for gentile converts was requisite for community membership since certain individuals were teaching that "[u]nless you are circumcised according to the custom of Moses, you cannot be saved".
Circumcision as a mandate was associated with Abraham (see also Abrahamic covenant), but it is cited as "the custom of Moses" because Moses is considered the traditional giver of the Law as a whole. The circumcision mandate was made more official and binding in the John 7:22 the words of Jesus are reported to be that Moses gave the people circumcision.