The Most Rev Justin Welby warned of the dangers of abandoning more than 1,000 years of Christianity during his first sermon as Archbishop.
A new chapter in the history of the Church of England began today as Justin Welby was anointed leader of the divided congregation.
The Bishop of Durham will be officially unveiled as the new Archbishop of Canterbury today.
The new Archbishop of Canterbury joked as he began his sermon, "It's got a good reverberation this cathedral".
Dancers sing an African hymn "Gbeh Kpa Kpa Ba" - or "A New Beginning" - celebrating the installation of Rt Rev Justin Welby as the 105th Archbishop of Canterbury.
Rt Rev Justin Welby is now installed as the Archbishop of Canterbury.
The Most Rev Justin Welby has arrived at Canterbury Cathedral for his enthronement.
Prime Minister David Cameron, the Prince of Wales and the Duchess of Cornwall are among those watching as the Most Rev Welby becomes the Archbishop of Canterbury.