In the 20th century, Christians have been persecuted by various groups, including the Islamic Ottoman Empire in the form of the Armenian Genocide, the Assyrian Genocide and the Greek Genocide, as well as atheistic states such as the Soviet Union and North Korea. During World War II members of some Christian churches were persecuted in Nazi Germany for resisting Nazi ideology.
In more recent times, the Christian missionary organization Open Doors (UK) estimates that over 200 million Christians face persecution, particularly in Middle Eastern countries such as Pakistan and Saudi Arabia.
Early Christianity began as a sect among Second Temple Jews, and according to the New Testament account, Pharisees, including Paul of Tarsus prior to his conversion to Christianity, persecuted early Christians. The early Christians preached the second coming of a Messiah which did not conform to their religious teachings. However, feeling that their beliefs were supported by Jewish scripture, Christians had been hopeful that their countrymen would accept their faith. Despite individual conversions, the vast majority of Judean Jews did not become Christians.