The establishment of Plymouth Colony by the Pilgrims in 1620 and the 1636 establishment of Rhode Island by Roger Williams were voted the eighth most important religion story of the second Christian millennium by the Religion Newswriters Association which consists of writers and editors who cover religion on a regular basis for the secular media in the US and Canada.
The leading story of the Millennium was Martin Luther's 95 theses.
Second was the wide spread dissemination of the Bible and other religious literature beginning with John Wycliffe's 1380 first translation of the Bible into English, the 1455 publication of the Gutenberg Bible and the 1605 publication of the King James Version.
Third was the Great Schism of 1054 which resulted in the first major split of Christianity resulting in the Eastern and Western churches.
Fourth was the Holocaust and the subsequent founding of Israel.
Fifth was Pope Urban's authorization of the 1095 Crusades to reclaim the Holy Land from the Muslims.
Sixth was the expansion of Islam in to Africa, Europe and Asia as well as India (where Buddhist culture was basically destroyed).
Seventh was the Second Vatican Council (1962-1965) resulting in the Roman Catholic Church reforming its liturgy and relations with other Christians and non Christian movements and the larger world in general.
Eighth was the establishment of Plymouth Colony and Roger Williams' establishment of Rhode Island, "foundational events in the history of religious freedom and separation of church and state in the United States, which later enshrined those principles in the Bill of Rights."
Ninth was the publication of the ideas of Charles Darwin, Karl Marx, Friedrich Nietzsche and Sigmund Freud.
Tenth was the 1906 Azuza Street revival in Los Angeles which gave birth to the modern Pentecostal movement, said to be the fastest growing new branch of Christianity.