The generation known as 'millennials' are now emerging into adulthood. They face opportunities and challenges no generation has previously faced. For the church they are the 'missing generation'. Ruth Perrin's landmark study of emerging adults who as teenagers described themselves as Christians, reveals what has happened to this apparently "lost generation" - those who have lost faith altogether, those with a faith but who have withdrawn from the church and those with an ongoing active faith which is nonetheless now broader and deeper than previously. Considering the factors which help shape millennial belief, Changing Shape reflects on the challenges and opportunities that 'missing generation' bring to the Church, and considers what lessons the Church can learn from the Millennial mindset.