The Public Religion Research Institute recently reported, based on their survey, on the reasons for young people  (not just RCs) leaving their childhood religion and becoming nones [was discussed 3 Oct by Maureen Fiedler in NCR].  Surprisingly, the majority (60%) of nones indicated that  what was important to their leaving was that they no longer believed in the teachings of their childhood religion.  The treatment of LGBTs was also important (to their leaving)  but to a much lesser extend (29%) and  an even less important contribution to their leaving was the clergy sex abuse scandal (19%).  I personally think religious faith has a lot more competition for young people now than when I was a young person.  I hope the experts can determine how to pass on a lasting faith to the younger generations.