A scholarly investigation and article that estimates the number of Muslim background believers who are followers of Jesus.
According to the abstract:
Since the 1960s, there has been a substantial increase in the number of known conversions from Islam to Christianity. Most of these conversions have been to forms of evangelical or Pentecostal Christianity, but there have also been conversions to Catholic and Orthodox Christianity, and still other converts claim to remain in some way both Muslims and followers of Jesus. This article explains how we obtained estimates of the number of converts, the complexities involved in this task, and an annotated list of countries by continent with the estimated number of believers in Christ from a Muslim background. The article includes charts with maximal, minimal, and medium estimates of this population from 1960 to the present.