How about the ones who are going to prison for accepting Christianity?
This is the thorniest problem. A moslem is commanded to lie if they can gain advantage by it, so no moslem can EVER be trusted.
A moslem can 'say' they are a Christian but how do you ever know? You don't.
Fortunately God gives us discernment and the Holy Spirit. I will openly admit that my discernment is not the best, which, when coupled with my severe lack of mercy (I tend to be much more justice driven than mercy driven, it's a characteristic of the teacher motivational gift) makes it hard for me to see any moslem as reformed. HOWEVER, some people can see who is sincere (my late wife was incredible at this. She could discern a fake from three counties away!), and these people will have to weed out the fakers from the new Christians.
The easy part of the problem is that those who are sincere have already got their ticket to heaven paid for (by Jesus of course) so they are safe no matter what happens here.