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Christianity was first introduced to Japan in 1549 by the Jesuit missionary Francis Xavier, who arrived from Goa, India, as part of a larger mission to spread Christianity throughout East Asia. He landed in Kagoshima, in the southern part of Japan.

At the time, Japan was in the midst of the Sengoku Period (Warring States era), a time of political fragmentation and constant conflict between feudal lords. The missionaries sought to gain the support of local rulers to aid in their evangelization efforts. Some daimyō (feudal lords), such as Ōmura Sumitada and Arima Harunobu, welcomed Christianity and even converted.

By the late 16th century, Christianity had made significant inroads in Japan, with over 150,000 believers. It influenced not only religious life but also culture, trade, and international relations. Christianity was seen as both a spiritual movement and a symbol of Japan's emerging connections with the West.

However, this period of relative acceptance was short-lived. The rise of powerful rulers like Toyotomi Hideyoshi and Tokugawa Ieyasu led to increasing suspicion of foreign influence, eventually resulting in the ban on Christianity and the beginning of severe persecution.

Christianity, which had been growing steadily in Japan since its introduction in the mid-16th century, faced a dramatic shift in the late 1500s and early 1600s. The religion was eventually banned, and believers were severely persecuted.

As Christianity spread, Japan's ruling authorities began to view it as a threat for several reasons: ties to foreign powers (association with European colonial powers like Portugal and Spain), disruption to social order (clashes with Buddhism and Shinto), and religious conflict between converts and Buddhist or Shinto institutions.

In 1587, Toyotomi Hideyoshi issued the "Edict of Expulsion of the Jesuits," ordering foreign missionaries to leave Japan. Although this was not a full-scale persecution, it marked the beginning of stricter control over Christianity.

After the Tokugawa shogunate was established in 1603, Ieyasu also viewed Christianity with suspicion. In 1612, he issued a ban on Christianity in Tokugawa-controlled territories, and by 1614, a nationwide prohibition was enacted — the expulsion of missionaries, the destruction of churches, and a ban on worship and proselytizing.

One of the most famous examples is the 1597 Martyrdom of 26 Christians in Nagasaki, where twenty-six missionaries and converts were crucified in public as a warning to others. The Shimabara Rebellion (1637–38), a revolt by oppressed farmers and Christians in Kyushu, was crushed by the shogunate, resulting in tens of thousands of deaths.

Following the rebellion, the Tokugawa regime intensified its crackdown through the use of "fumie" (stepping on Christian images) and a network of informants. This practice continued for more than 200 years, until the ban on Christianity was lifted in the Meiji period.

Even after Christianity was officially banned and missionaries were expelled from Japan, many believers continued to secretly uphold their faith. These individuals came to be known as "Kakure Kirishitan," or Hidden Christians.

To avoid detection, they outwardly appeared to follow Buddhism or Shintoism, while secretly passing down their Christian faith within families and close communities. Without access to priests or churches, they memorized prayers and conducted rituals themselves, adapted religious icons (such as worshiping the Virgin Mary in the form of the Buddhist deity Kannon), used Buddhist prayer beads instead of rosaries, and translated Latin and Portuguese prayers into Japanese, preserving them orally across generations.

Hidden Christians were primarily found in regions where Christianity had once flourished, such as Nagasaki Prefecture (Goto Islands, Hirado, Sotome), the Amakusa Islands, and other remote mountainous or coastal areas.

In 1865, a group of Japanese villagers visited the Ōura Cathedral in Nagasaki and revealed to the French priest, Father Petitjean, that they shared the same faith. This event shocked the global Catholic community — it was the first confirmation that Christianity had survived in Japan in secret for over 200 years.

With the Meiji Restoration in 1868, Japan shifted from the feudal Tokugawa shogunate to a centralized modern state. As part of its efforts to modernize and gain equal standing with Western powers, the Meiji government actively adopted Western systems and culture — including religious policy reform.

The longstanding ban on Christianity, which had been in place since the early 17th century, was officially lifted in 1873. Following this, many Christian missionaries from Western countries, especially the United States, France, and the UK, returned to Japan and resumed their evangelism.

For the first time in about 250 years, freedom of Christian belief has been restored in Japan.

Today, less than 1% of Japan's population identifies as Christian, including Catholics, Protestants, and members of the Orthodox Church. While churches exist throughout the country, regular church attendance is low, even among those who identify as Christian.

In modern Japan, Christianity is often more influential as a cultural and educational force than as a religion of personal faith. Many prestigious private schools and universities have Christian roots, such as Aoyama Gakuin, Doshisha University, Rikkyo University, Kwansei Gakuin, and Ferris Jogakuin.

Holidays like Christmas and Valentine's Day, rooted in Christian tradition, are widely celebrated as commercial and seasonal events. Many Japanese couples prefer chapel-style weddings, reflecting the symbolic and cultural appeal of Christianity.

The "Hidden Christian Sites in the Nagasaki and Amakusa Regions," now a UNESCO World Heritage site, show how Christian faith and local culture coexist. While many churches face challenges such as an aging congregation, churches with growing foreign communities (from the Philippines, Korea, and Brazil) are becoming more diverse and vibrant.