The edict of Milan which decreed tolerance of Christianity was followed by a time of parallel existence of Christianity and paganism which was, though, far from an actual religious pluralism - the religion of the emperor was always at an advantage, and the Arianism|[[Arian, Trinity|trinitarian ]] and pagan emperors in the fourth century saw it as perfectly legitimate to take measures against religious leaders who did not share their belief. By the fifth century, the western Roman Empire had crumbled, but the same patterns of behavior continued in the Gaul, Celtic, and Germanic kingdoms that replaced it.

Many smaller Christian groups in the US and Canada have come into being over the last 40 years, such as "Christians for Israel". Their website says that they exist in order to "expand Christian-Jewish dialogue in the broadest sense in order to improve the relationship between Christians and Jews, but also between Church and Synagogue, emphasizing Christian repentance, the purging of anti-Jewish attitudes and the false '[[Replacementtheology]]' theology rampant throughout Christian teachings."

:In our times. Professor John N. Karmiris, University of Athens, based on his studies of the Church Fathers, concludes that the salvation of non-Christians, non-Orthodox and heretics depends on the all-good, allwise and all-powerful God, who acts in the Church but also through other "ways." God's saving grace is also channelled outside the Church. It cannot be assumed that salvation is denied non-Christians living in true piety and according to [[natural law ]] by the God who "is love" (1 John 4:8), In his justice and mercy God will judge them worthy even though they are outside the true Church. This position is shared by many Orthodox who agree that God's salvation extends to all who live according to His "image" and "participate in the Logos." The Holy Spirit acted through the prophets of the Old Testament and in the nations. Salvation is also open outside the Church.

Many fundamentalist Fundamentalist Protestant Christian (FPC) groups hold that only fundamentalist Protestant beliefs provide a pathway to God and salvation. All other Christian groups are held to be heretical, and are sometimes attacked as Satanic hence the [http://sebomenoi.org/index.php/Petrine Petrine] Cross has likewise become promoted by FPC groups as Satanic. Neo-evangelicalism|Neo-evangelical Protestant Christian Churches reject this view outright, and hold that most forms of Christianity are valid pathways to God. They continue to believe in "one" church, but see the Church as being generally invisible and intangible. Many Protestants doubt that either Roman Catholicism or Eastern Orthodoxy are still valid manifestations of the Church.