The C-Spectrum is a practical tool some missionaries use to describe six types of Christian communities found in Muslim contexts. It is a coded scheme devised to see how contextualized one can become within Islam, even to the point of being considered a Muslim.
On the far left is C1, a traditional church that uses outward elements foreign to Muslim culture and considered Christian by both Christians and Muslims. On the far right is C6, supposed secret followers of Jesus but still considered Muslim by the Islamic community. Think of a C5 believer as one that makes a Muslim pause and tilt his head.
John Travis (a pseudonym) has written assiduously on this matter and is among the greatest proponents of what missiologists call the Insider Movement, a method of evangelizing Muslims that allows them to remain as active participants of Islam. Below is a summary of some C5 ideology.
Insiders Believe Religious Affiliation Doesn’t Matter
In his article, “Must all Muslims Leave Islam to Follow Jesus”, Travis tells of a question his daughter brought to him: “Daddy, can a Muslim go to heaven?”
I responded with an Acts 15:11-type ‘yes’: If a Muslim has accepted Isa (Jesus) the Messiah as Savior and Lord, he or she is saved, just as we are. We affirmed that people are saved by faith in Christ, not by religious affiliation. Muslim followers of Christ (i.e., C5 believers) are our brothers and sisters in the Lord, even though they do not change religions.
Let us keep our eye on the ball. No one is arguing against the opportunity that even the worst of sinners have for salvation. Those of any false religion will be granted eternal life based on the merits of Christ. But this girl’s question addressed the results of such a supposed conversion.
Suppose his daughter asked a similar question? “Daddy, if a Buddhist, atheist, or Satanist has accepted Jesus as Savior and Lord, can he be saved and not leave his religion?” If Travis answers yes, then he has no problem with Christians dabbling in the occult and denying God’s existence. If he answers no, then I wonder why a Satanist must leave his place of worship but a Muslim must not. This brings us to the crux of the issue.