on their member roles. Until or unless their names are removed, they count towards their membership.

The LDS church accurately counts baptized individuals as members.

Also, you aren't looking at all the sources.

The Church as a source is counting who is technically a member. The number you are going with is how do adults self-identify at a given point in time, which is a much more fluid number.

If you dig a little more, you'll find that what I've said is true--55% is the lowest number reported, and other valid sources, including the Church itself, report a higher number.

All sources agree on some points--such as the fact that SLC is between 48-50% LDS.