wasnt that back before they accepted blacks as members ?
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They always accepted blacks as members, but blacks could not hold the LDS priesthood (which all other members do) until 1978. Not holding the priesthood is tantamount to going to Hell as it is required to get to the Mormon Heaven (Celestial Kingdom).
The problem with them ‘evolving’, is the LDS claim to be a RESTORED church, meaning that the church Christ founded (a denomination) was lost and Joseph Smith brought it back exactly. No changes allowed. So, if they ‘evolve’ as you say, then they lose the entire premise of their religion and the need for it. They become what they complain about in other churches ‘reformed’ not ‘restored’.