Release International has warned that Christians face a growing risk of persecution this year in parts of the Islamic world.
Areas of special concern are Egypt, Pakistan, and northern and central Nigeria.
Release partners in Egypt estimate that around 100,000 Christians have left the country since 2011.
Coptic Christians boycotted the recent referendum on the constitution because they felt it represented only the Islamists who drafted it.
They fear that the constitution will further restrict the rights of religious minorities.
There are particular concerns for Christian converts from a Muslim background, who have in the past been detained and tortured by security forces.
"Persecution of Christians in Egypt is increasing, along with Islamisation. Fundamentalists are taking advantage of Muslim-Christian conflicts," said a Release partner in the countr.
Release chief executive Paul Robinson said: "Please pray for Christians in Egypt at this time of change.
"Pray for unity and a growing boldness in their witness."
Read more at www.christiantoday.com.