These types of data are meaningless to me except as to reflect what people have communicated to whoever is gathering the information. While there may be many more who identify themselves as Catholic now than in 1990, a substantial number of “pro-choice Catholics” no exist, who openly support abortion rights and artificial birth control. On the national level consider Ted Kennedy, Nancy Pelosi, and Kansas Governor Kathleen Sebelius who is reported to be in line for a cabinet post.
Mainline protestants are in serious decline. Churches preaching a “prosperity gospel” (being saved will make you rich) are ascendant. Consider the popularity of books written by Joel Osteen and Rick Warren in the past few years.
From the evidence I see, it appears organized religion is losing influence at a fast rate of speed, regardless how many come in the doors on Sunday morning. To me, this is truly losing ground.