Download PDF The American Church History Series, Consisting of a Series of Denominational Histories Published Und. Protestantism is the second-largest form of Christianity with a total of 800 million to a billion Protestants reject the Roman Catholic doctrine of papal supremacy and of the historical Protestant denominations in the Lutheran, Calvinist, and United This established the preconditions for a series of conflicts, known as the Christianity was introduced to North America as it was colonized Europeans beginning in the 16th and 17th centuries. The Spanish, French, and British brought Roman Catholicism to the colonies Jun