Christianity in Japan is among the nation's minority religions; reports of adherent differ, ranging from around one percent to six percent of the population claiming Christian belief or affiliation. Nearly all known traditional denominations of Christianity, including Roman Catholicism, Protestantism and Orthodox Christianity, are represented in Japan today. A recent poll conducted by the Gallup organization found Christianity to be the fastest growing religion among Japanese youth .

The root of the Japanese word for Christianity (キリスト教, Kirisuto-kyō^?) comes from the Japanese katakana transcription of the word Cristo (キリスト, kirisuto^?), Portuguese word for Christ, and the Japanese word for doctrine (教, kyō^?, a teaching or precept).

Japan remains one of the most secular nations in the world according to the World Values Survey. While there may be up to 3 million Japanese Christians,Christianity in Japan is spread among many denominational affiliations. 70% of Japanese churches have an average attendance of less than 30, though membership is double this figure.

In Japan may refer to:

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Japan ⁱ/dʒəˈpæn/ (Japanese: 日本 Nihon or Nippon; formally 日本国  Nippon-koku or Nihon-koku, literally the State of Japan) is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south. The characters that make up Japan's name mean "sun-origin", which is why Japan is sometimes referred to as the "Land of the Rising Sun".

Japan is an archipelago of 6,852 islands. The four largest islands are Honshū, Hokkaidō, Kyūshū and Shikoku, together accounting for ninety-seven percent of Japan's land area. Japan has the world's tenth-largest population, with over 127 million people. The Greater Tokyo Area, which includes the de facto capital city of Tokyo and several surrounding prefectures, is the largest metropolitan area in the world, with over 30 million residents.

Archaeological research indicates that people lived in Japan as early as the Upper Paleolithic period. The first written mention of Japan is in Chinese history texts from the 1st century AD. Influence from other nations followed by long periods of isolation has characterized Japan's history. In the late 19th and early 20th centuries, victory in the First Sino-Japanese War, the Russo-Japanese War and World War I allowed Japan to expand its empire during a period of increasing militarism. The Second Sino-Japanese War of 1937 expanded into part of World War II in 1941, which came to an end in 1945 following the atomic bombings of Hiroshima and Nagasaki. Since adopting its revised constitution in 1947, Japan has maintained a unitary constitutional monarchy with an emperor and an elected parliament called the Diet.

The Hata clan (秦氏^?) was an immigrant clan active in Japan since the Kofun period, according to the epic history Nihonshoki.

Hata is the Japanese reading of the Chinese (state and dynasty) name 秦 given to the Qin Dynasty (the real family name was Ying), and given to their descendants established in Japan. The Nihonshoki presents the Hata as a clan or house, and not as a tribe; also only the members of the head family had the right to use the name of Hata.

The Hata can be compared to other families who came from the continent during the Kofun period: the descendants of the Chinese Han Dynasty, by Prince Achi no Omi, ancestor of the Yamato no Aya clan, the Sakanoue clan, the Tamura clan, the Harada and the Akizuki clan; also, the descendants of the Chinese Cao Wei Dynasty by the Takamuko clan. The descendants of Baekje (Kudara in Japanese) who sought refuge in Japan, for example the Yamato no Fubito (also called Yamato no Fubito-和史 later given a new title, Takano no Asomi-高野朝臣) , Kudara no Konikishi clan, and the Sue clan.