Parts of certain parts are partially accepted while the rest are dissected out of the Tanakh (Hebrew Bible).
The writer of the New Testament book of Hebrews, speaking of believers of old, says this: "Still others had trial of mockings and scourgings, yes, and of chains and imprisonment. They were stoned, they were sawn in two (that would be Isaiah), were tempted, were slain with the sword. They wandered about in sheepskins and goatskins, being destitute, afflicted, tormented---of whom the world was not worthy" [Hebrews 11:36-38].
Twice have Israel's children dissected Isaiah: once with a saw when murdered, and a second time with the scalpel of unbelief when they rejected the prophet's inspired words regarding the suffering Messiah. Israel is no different today than when they chose king Saul rather than Jehovah as King.
Modern Protestantism is infatuated with Israel because they, like the Jews of old, are looking for Christ to set up a temporal kingdom in Jerusalem. Neither Israel nor Protestants truly comprehend that the war that rages is not about land or political power, it is about souls. It is a battle between things good and things evil; a battle between Christ and Satan.
When Seventh-day Adventists broach the subject of spiritual Israel vs. literal Israel they are accused of preaching a replacement theology; replacing Old Testament scriptures that refer to then literal/spiritual Israel with a New Testament understanding of spiritual Israel; those who have accepted God and His Christ whom the Jews rejected and continue to reject. They are still a stiffnecked and disobedient people. [Deuteronomy 9:6]
The words of Christ are clear enough when, as He left the temple for the last time before His crucifixion he said, "See! Your house is left unto you desolate." [Matthew 23:38] Paul, a pharisee and the son of a pharisee wrote these words: "For he is not a Jew who is one outwardly, nor is circumcision that which is outward in the flesh; but he is a Jew who is one inwardly; and circumscision is that of the heart, in the Spirit, not in the letter; whose praise is not from men but from God.: [Romans 2:28, 29]
So this comes down to what? to a prejudiced unbelief.
The Jews have slipped from being number one to some other place down the chart. Protestants prop up the Jews because they too have edited and reinvented the words of the prophets and the Christ.
Seventh-day Adventists ought to be leaders in rightly dividing the Word; but to rightly divide is to be expert in operating within the pages of the Bible. Perhaps it's time for an advanced externship in the "meat" of the word, rather than "milk".
Study on! e.c.