'The Sacred Diary of Adrian Plass Aged 37 3/4 is the book that launched Adrian Plass as the UK's best-selling Christian author. Featuring the diary entries of fictional character Adrian Plass, ''an amiable but somewhat inept Christian,'' the book is side-splittingly funny. By his own confession, Adrian ''makes many mistakes and is easily confused,'' but a reassuring sense of belonging to the family of God and pointing to the hop in Jesus is the solid, underlying theme.'