This led to renewed interest in both religion and nationalism. More Muslims dared to turn to Christianity. At the same time, other Muslims became more extreme in their faith and their national identity. You have a collision. The Church in Islamic countries across the world is suffering severely for daring to worship Jesus.
Persecution also continues under communism.
Christians in China and neighbouring countries are standing firm in the midst of oppression. But, despite the pressure, indeed because of it, the Church is growing fast. Sometimes Christians suffer because they are in the midst of civil unrest war. Religion is not the real issue, but is a convenient excuse. You find this problem in Indonesia and several Latin American countries.