I've read The Sacred Diary of Adrian Plass on Tour (aged far too much to put on the cover of a book) at least three times, and it gets funnier and more poignant every time. Though the title character shares the author's name, it is a book of fiction. Adrian Plass gently pokes fun at various aspects of Christian living, but while I laugh I notice the spiritual truths he is pointing out.
It is the fifth book in a series. The first four are:
The Sacred Diary of Adrian Plass, aged 37 3/4
The Theatrical Tapes of Leonard Thynn
The Horizontal Epistles of Andromeda Veal
The Sacred Diary of Adrian Plass, Christian Speaker, aged 45 3/4
DISCLOSURE OF MATERIAL CONNECTION: http://cmp.ly/0