Forsyth is married and has four children and eight grandchildren. He attended Meadowbank Boys High School and was a candidate for the Methodist ministry for a number of years but changed to Anglican candidature in 1972.
On 19 January 2008, Forsyth condemned Corpus Christi, a play depicting Judas seducing Jesus: "It is deliberately, not innocently, offensive and they're obviously having a laugh about it." The play also showed Jesus administrating a marriage between two of his male apostles.
- Profile on the Diocese of Sydney's website
- "Just a fiery glitch", an article in the Sydney Morning Herald after St Barnabas' church building was destroyed by fire.
- "Church spends $50K to debunk Da Vinci claims", a story from the Sydney Morning Herald about the Sydney diocese's response to The Da Vinci Code.
- "Church acts against Da Vinci film", a story from BBC News.