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Stats:

68% of those raised Roman Catholic still are Catholic (comparable with or better than the retention rates of other religious groups). 15% are now Protestant (9% evangelical); 14% are unaffiliated. Pew forum, Faith in Flux (April 27, 2009) http://pewforum.org/uploadedfiles/Topics/Religious_Affiliation/fullreport.pdf
44 percent of Americans have switched religious affiliations since childhood, mostly mainline Protestants. 7% who were raised Protestant are now unaffiliated; 15% now belong to a different Protestant faith. ^
80% of adults who were raised Protestant are still Protestant. ^
51% of Protestants from a different Protestant denomination cite a lack of spiritual fulfillment as a reason for leaving their childhood faith. 85% say they joined their current denominational faith because they enjoy the services and style of worship Only 15% left say they left because they stopped believing in its teachings. ^
Those who have left Catholicism outnumber those who have joined the Catholic Church by nearly a four-to-one margin. 10.1% have left the Catholic Church after having been raised Catholic, while only 2.6% of adults have become Catholic after having been raised in a different faith.
4% of Americans raised Catholic are now unaffiliated; 5% are now Protestant. ^
Over 75% of those who left Catholicism attended Mass at least once a week as children, versus 86% having done so who remain Catholics today.^
Regarding reasons for leaving Catholicism, less than 30% of former Catholics agreed that the clergy sexual abuse scandal played a role in their departure. ^
71% of Protestants converts from Catholicism said that their spiritual needs were not being met in Catholicism, with 78% of Evangelical Protestants concurring, versus 43% of those now unaffiliated. ^
50% of all Protestants converts from Catholicism said they stooped believing in Catholicism's teachings overall. Only 23% (20% now evangelical) were unhappy about Catholicism's teachings on abortion/homosexuality (versus 46% of those now unaffiliated); 23% also expressed disagreement with teaching on divorce/remarriage; 16% (12% now evangelical) were dissatisfied with teachings on birth control, 70% said they found a religion the liked more in Protestantism.
55% of evangelical converts from Catholicism cited dissatisfaction with Catholic teachings about the Bible was a reason for leaving Catholicism, with 46% saying the Catholic Church did not view the Bible literally enough.
81% of all Protestant converts from Catholicism said they enjoyed the service and worship of Protestant faith as a reason for joining a Protestant denomination, with 62% of all Protestants and 74% Evangelicals also saying that they felt God's call to do so. ^
42% of those now unaffiliated stated they do not believe in God, or most religious teaching. ^ For more see HERE