A few years ago I was talking with Nasser and he was telling me how important the book of Ephesians was for him as a new believer and that it is one of the places he takes new believers. I recently created an Ephesians story set as a Discovery Bible Study and have been working through it with two former Muslims. It's been a good resource. Still working out a few kinks in how I facilitate, but it has been helpful - especially in discussing the idea of "works". Ephesians 2 helps to reframe works away from the Islamic worldview of working to earn favor or to somehow get yourself into heaven to the Christian worldview of working in partnership with the creator God who created you (his handiwork) for good works which he prepared in advance for us to do. That was a pretty big thing for these two guys.
The discovery Bible study is attached as a PDF for anyone to use if you think it is helpful.
(Watch Nasser's Testimony here:https://www.crescentproject.org/resources#rsvideo)