Mormon Membership Numbers
David Tufte, an economics professor at Southern Utah University, commented on membership statistics for the LDS Church. He points out (while commenting on an AP story that makes the same observation) that Latter-day Saints have a looser standard for counting members than many other denominations.
In contrast, other denominations often use substantially stricter rules. For example, many Protestant churches only count as adherents those who are both baptized and who attend at least once a year on a "normal" Sunday (i.e., one that does not have special religious significance). Baptists only count as members those who were both baptized as adults of their own free will, and who regularly attend services - children are adherents and are removed from those rolls if they do not choose to be baptized upon their majority. Catholics baptize at a younger age, but shift people from the memberhsip rolls to the adherent rolls if they stop attending regularly.