以往單一地區的宗教研究很難成為一個重要的議題，但是淡水的宗教發展具有地理與歷史的特殊地位，特別是對於台灣北部的基督教發展有無可取代的歷史價值。戰後，淡水基督教主要是「長老教會」與「天主教」兩個教派。2000年以來，因著「淡海新市鎮」的形成，加上基督教都會區宣教活動的興起，淡水又快速增加許多教會。在淡水，教會的設立與發展，往往和人口之增加及聚落分佈息息相關，在人口移入較多的地區，教會數也會較多；而人口遽增的時期，教會設立的速度也會較為密集。而新教會的經營與運作模式，也反映了所處社區的特質與需求。本文將就戰後至民國一百年（1945-2011）共五十五年間的淡水基督教發展軌跡做一個梳理，主要的論述皆集中於淡水市鎮之開發對於基督教會發展之影響，藉由史料之閱讀以及田野調查之成果，對於戰後淡水基督教發展之輪廓進行一個初步的描繪。

In the past, the study of regional religious is very hard to become an important issue. But the religious development of Tamsui has special geographical and historical meanings, especially for the development of Christianity in northern Taiwan. After 1945, the most important Christian dominations in Tamsui are “Presbyterian Church” and “Catholicism.” Since 2000, churches have increased rapidly because of the formation of “Tamhai New Town,” and the springing up of the metropolitan missionary activities. In Tamsui, the establishment and development of the church are closely associated with the increase in population and settlement distribution. In the regions of more immigrants, there will be more churches. And in the period of rapid population growth, the church will be set up more intensively. The operation modes of the new churches also reflect the characteristics and needs of their local communities. This paper aims to explore the development of the Tamsui Christianity from 1945-2011, laying great stress on how Tamsui’s development influences the development of the Christian Churches. Through historical reading and field work, it attempts to give a preliminary interpretation of the post-war development of the Tamsui Christianity.