In September 2005, a middle-aged woman was taken by state security officials from her home in North Korea’s North Pyongan Province. She was put under arrest and taken to a local farm, where government officials had assembled in the threshing area to carry out her punishment. The sole civilian witness eventually fled to South Korea and reported what unfolded next to the Database Center for North Korean Human Rights. As he told the private human rights group, “Guards tied her head, her chest, and her legs to a post, and shot her dead.” He added, “I was curious why she was to be shot. Somebody told me she had kept a Bible at her home.”

Merely having the Christian Scriptures, which likely were smuggled across the border from China, put the unknown woman under suspicion of converting to Christianity, and perhaps even sharing her new faith with others. Our research, drawn from United Nations studies, U.S. governmental sources, newspaper accounts and documentation from churches, think tanks and human rights groups, found that in North Korea, Iran, Saudi Arabia and elsewhere, Christian conversion is treated as a capital crime or otherwise severely punished.

The right of conversion, as long as it is not forced, is an integral part of the fundamental human right to religious freedom. Yet, as we document in our new book, “Persecuted,” in many countries, in various parts of the world, and stemming from various motives, religious conversion draws horrific reprisals.

In his report to the United Nations General Assembly last year, the U.N. special rapporteur on religious freedom, Heiner Bielefeldt, found that “[c]ountless reports of grave violations of the right to freedom of religion or belief relate to converts and those who try to convert others by means of noncoercive persuasion.”

Persecution for conversion to Christianity--a faith with the “Great Commission” to share the Gospel--is rising globally, along with persecution of some very long-established, even 2000-year-old, Christian communities. Persecution typically happens in places where Christians are a minority, where communist ideology still holds sway, in the Muslim world, or where conversion is seen as a threat to national identity.

Iran is a prime example of the growing number of states that harshly punish converts for apostasy from Islam. In January, the Rev. Saeed Abedini, an Iranian-American citizen, was sentenced to eight years imprisonment in Tehran’s brutal Evin Prison for his own conversion, as well as for his ministry with Iran’s burgeoning underground evangelical churches. Another Christian pastor, Yousef Nadarkhani, who was first jailed in 2009 and sentenced to death, was released from prison earlier this year after international pressure.

In September 2012, the U.N. special rapporteur on human rights in Iran, Ahmed Shaheed, said “scores of other Christians appear to remain in detention for freely practicing their religion,” and that over the past two years more than 300 Christians have been arrested and detained arbitrarily in Iran. These arrests result from accusations of proselytizing.

In Egypt, perceived apostates face many difficulties. In January, an Egyptian court sentenced Nadia Mohamed Ali and her seven children to 15 years imprisonment for reconverting to Christianity. Born a Christian, Nadia converted to Islam in order to marry a Muslim man; after his death, she returned to Christianity and ran into trouble when she had the family’s official identity cards changed to reflect this.

Saudi Arabia requires all its nationals be Muslims and can punish apostasy with beheading. Christian converts also risk honor killings, being murdered by their relatives. In 2008, Gulf News reported that Fatima Al-Mutairi was “burned to death and her tongue had been cut out” by her Saudi father, a religious policeman, after her brother discovered a photo of a cross on her computer screen.

A 2012 study by the Washington based Pew Research Center found that proselytism, or talking about one’s faith to others, was specifically restricted by central or local governments in 66 countries.

An example occurred on March 10, 2013, in Libya, where Ezzat Hakim Atallah, a 45-year-old Coptic Christian from Egypt, was reported tortured to death with electric shocks by security police in order to exact a confession of proselytizing. Five other Copts detained with him remain jailed.

Though India is renowned for its religious pluralism, various states in India, influenced by Hindu nationalists, have anti-conversion laws. Ostensibly to protect against coerced conversion from Hinduism, some are so vaguely worded that even spiritual benefits or charity work could be deemed illegal inducements. The worst abuses occur when, stirred by their local political and religious leaders, Hindu mobs riot against entire Christian families or villages. In fact, around the world, the Pew Research study finds generally that social hostilities are 2.5 times higher when governments limit conversion.

Vietnam’s leaders seem to view converting to Christianity in northwest provinces among the Hmong and in the Central Highlands among various ethnic tribes to be a security threat. In addition to suffering beatings and imprisonment and having their homes torn down and property confiscated, some converts there have been forced to “reconvert” to traditional practices of ancestor worship.

Converts to various other faiths are persecuted as well, usually by the same forces that punish Christian conversion. Members of the Bahai faith, a religion that acknowledges a prophet after Islam’s Prophet Mohammed, are deprived of all constitutional rights in Iran and their entire leadership is serving a 20-year sentence. Similarly, the Ahmadi Muslim community is targeted under blasphemy laws in Pakistan. Converting others to Islam is punished in parts of India by Hindu nationalists.

The U.N.’s Bielefeldt concludes that persecution for conversion has become a “human rights problem of great concern.”

Couched in U.N. diplomatic language, this is a sound of alarm. Recent decades have seen the rapid global spread of Christianity and many thousands of Asians and Africans who are choosing to become Christians are paying a very steep price.

It is time that the West, including Western Christians, end their indifference and recognize this for what it is: an egregious human rights violation.

We must raise our voices for those facing the executioner’s sword, detention camps or other atrocities for their beliefs just as we do for other human rights victims. As the Rev. Dietrich Bonhoeffer, in opposing Nazi persecution, had once reminded his fellow Germans: “Not to speak is to speak. Not to act is to act.”

Nina Shea is director of Hudson Institute’s Center for Religious Freedom and co-author of Persecuted: The Global Assault on Christians (Thomas Nelson Publishers, March 2013).