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> What good is an act of faith when you're literally experiencing the truth of the claims at that very moment?
I don't know what kind of information spirits in the spirit world have, but the LDS church teaches that there's some teaching of the gospel still going on in the spirit world, so presumably spirits don't automatically have complete information. The LDS teaching is that baptism is prerequisite for attaining the highest degree of glory, and all spirits have the opportunity in the spirit world to accept baptism by proxy if they did not have an opportunity during their life to be baptized or chose not to be.
See also:
https://en.wikipedia.org/wiki/Fate_of_the_unlearned#Latter-d...
https://en.wikipedia.org/wiki/Spirit_world_(Latter_Day_Saint...
https://en.wikipedia.org/wiki/Plan_of_salvation_(Latter_Day_...