All because they are not ashamed of Jesus or the gospel. Or - consider the situation in Egypt, home of one of the oldest civilizations on earth. Islam is the state religion. It is against the law to propagate any religion other than Islam. Christians who witness of their faith risk physical attack or arrest.
Churches face onerous restrictions on building or repairing their buildings.
Laws regularly discriminate against Christians families are broken up by kidnappings and forced conversions to Islam, believers are barred from senior public and private jobs. The family of 16 year old Suhir Gouda is an example. She was an 11 th grade student. In late February of this year she did not come home from school. An eyewitness reported that she had been taken away by their neighbour, together with other men.