I have not made that comparison. But Jesus did say, 'Truly I say to you, to the extent that you did it to one of the least of these brothers of Mine, you did it to Me.' (Matthew 25:40).
I wanted to know if Baptists regarded Seventh-day Millerites to be Baptists of some sort. Apparently, Baptists now refuse to confess that even William Miller was a Baptist after he and the majority at his church were dishonestly disfellowshipped by a crafty cabal of carnal churchian criminals.
Jesus also gave instructions for church discipline, which Miller's Church followed by disfellowshipping with him because his beliefs were/are contrary to the teachings of Jesus Christ.
I'm going to answer the question of the OP one more time. Yes, Miller stopped being a Baptist when the Baptist church he belonged to disfellowshipped with him because of his failed prophecy and contrary beliefs. Additionally, there is no evidence Miller and his teachings were accepted by another Baptist church after the disfellowship, therefore he stopped being a Baptist.
There's only over 20 million Seventh-day Adventists that liken William Miller and the Millerites to Elisha and Elijah. That's nothing, of course, when considering that there's five chapters in the book of Revelation devoted to the Millerite movement.
It was Ellen G. White, the unquestioned prophetess of Seventh-day Adventists, that likened William Miller and the Millerites to Elisha and Elijah. In writing about William Miller, Sister White also said that "angels watch the precious dust of this servant of God, and he will come forth at the sound of the last trump." - Early Writings, p. 258.
William Miller dreamed that he would be vindicated and Sister White even included Miller's dream in her Early Writings. But no statement by Ellen White should be accepted unless it could be verified independently -- directed from the Bible or from hard science.
The Biblical insight that vindicates Brother Miller is only a recent revelation. I thought that Baptists should be respectfully challenged by the testable revelation and by the historic evil of only a small minority of Baptists disfellowshipping William Miller and the majority of the Baptists that sided with Miller from his Baptist church.