The first step thas now been taken in the form of an initial draft. John also helped me find someone to go through it, and it has now been read through by a native speaker of British English who is himself an author of several books.
Here is the outline with page numbers from Word (A4 paper format):
Introduction 6
God has arranged all things
The big questions
1 God's two books 14
Does science make religion unnecessary?
A faith to be proud of
Too much to doubt and too little to believe
Seven different perspectives