This document provides a summary of Christianity in Asia in the 19th century, with a focus on developments in South and Southeast Asia. It describes the decline of Catholicism in many regions of Asia around 1800 due to various political and social factors in Europe. It also discusses the decline of Protestantism established by Dutch and other colonial powers. A new period began with the founding of the missionary center of Serampore in India in 1800 by British Baptists led by William Carey, which had a major regional impact through activities like Bible translation, printing, and education. The rapid growth of Protestant missionary activity in Asia in the 19th century had significant social and cultural influences beyond just evangelism.