One way or another, every church leader who supports missions among Muslims needs to answer this question with regard to contextualization: how far is too far? Missions agencies advocate different approaches, and missionaries often develop new theories and methods in the field, so many churches have studied the issue and developed their own guidelines for strategy and support.
John Piper depends on many experienced missionaries and pastors at Bethlehem Baptist Church who help him discern the related issues: whether new followers of Jesus Christ can stay in the mosque, continue to call themselves Muslims, refer to Jesus as the “Son of God,” and so on. In this interview, he tells me what he appreciates about the impulse behind the Insider Movement and why Westerners struggle to understand the consequences of belief among Muslim-background believers.
Piper also raises an important problem with the Insider Movement not always appreciated by its proponents: the staunch opposition of many Muslim-background believers who have sacrificed so much to follow Christ and reach their friends, family, and neighbors with the gospel.