The church grew like wildfire in the 1500 years after Jesus’ death. It quickly changed from being a small Jewish sect into the religion of Europe. Although Christianity had originally been a movement of Jews, immediately after gaining a Gentile majority of the membership sometime in the 2nd century, it was still a religion with its heaviest concentration in Israel, the Near East, and North Africa. It was not until the adoption of Christianity by the Roman Emperor Constantine in the 4th century that Christianity began to be associated with Europe and Western culture. (We must never forget how Jewish, Asian, and African our faith is.)
Ellingsen, Mark, "A Very, Very Brief History of the Pre-Reformation Christian Church" (2016). Interdenominational Theological Center Faculty Publications. 4.
Ever-Reforming: A Reformation 500 Cross-generational Study, edited by Mindy Makant and Eric Childers, 11-12. Salisbury, NC: North Carolina Synod, 2016.