[k2blader]

Under the practice, known by Mormons as vicarious baptism — a significant rite of the church — the dead are baptized by living church members who stand in as proxies.

Why? Baptism doesn't save, even when you're alive.

[AppyPappy]

Baptism doesn't save, even when you're alive.

In the early church, they thought that you had to be baptized to be "saved". So they baptized people after they had died. The idea of a proxy baptism is rather odd though.