Point was, if God can change a practice in the past, who is man to say He can't do the same today? You admit it was done after all.
God can change a practice ... it is the gospel which is unchanging ... per Paul in Galatians 1:8.
As for Galatians 1:8, that goes with what I said about principles being eternal. For the record, it is the LDS position that our teachings are the gospel as Christ taught it, and that orthodox chrisitanity has lost and altered those teachings over the ages.
You are correct ... it is the LDS position that orthodox christianity has lost and/or altered JESUS'/Paul's/Peter's/etc.'s recorded teachings over the ages. Thus, ... I think that it is YOU who have the task of demonstrating that this assertion is true in regard to orthodox christian belief.
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orthodox adj. 1. Adhering to the accepted or traditional and established faith, especially in religion.
2. Adhering to the Christian faith as expressed in the early Christian ecumenical creeds.
3. Orthodox. a. Of or relating to any of the churches or rites of the Eastern Orthodox Church. b. Of or relating to Orthodox Judaism.
4. Adhering to what is commonly accepted, customary, or traditional: an orthodox view of world affairs.
In the 1800's the Lord Jesus Christ restores His Church and Word here on earth again, now this seem peculiar to those who have been born into the Tradition Creeds, which a tradition does not make it authentic! For over time many records were gathered for the different Bibles, and many Bibles were burned, as well as many men, of God were burned over the struggle of the Word, of the Lord.
In the scriptures we are taught how to discern those things which belongs to the Lord!