Except he's stating SDA doctrine. Let's go over the foundation of the SDA.
Adventist History
The Seventh-Day Adventist church traces its roots to American preacher William Miller (1782–1849), a Baptist who predicted the Second Coming would occur between March 21, 1843, and March 21, 1844. Because he and his followers proclaimed Christ’s imminent advent, they were known as "Adventists."
When Christ failed to appear, Miller reluctantly endorsed the position of a group of his followers known as the "seventh-month movement," who claimed Christ would return on October 22, 1844 (in the seventh month of the Jewish calendar).
When this didn’t happen either, Miller forswore predicting the date of the Second Coming, and his followers broke up into a number of competing factions. Miller would have nothing to do with the new theories his followers produced, including ones which attempted to save part of his 1844 doctrine. He rejected this and other teachings being generated by his former followers, including those of Ellen Gould White.
Miller had claimed, based on his interpretation of Daniel and Revelation, that Christ would return in 1843–44 to cleanse "the sanctuary" (Dan. 8:11–14, 9:26), which he interpreted as the earth. After the disappointments of 1844, several of his followers proposed an alternative theory. While walking in a cornfield on the morning of October 23, 1844, the day after Christ failed to return, Hiram Edson felt he received a spiritual revelation that indicated that Miller had misidentified the sanctuary. It was not the earth, but the Holy of Holies in God’s heavenly temple. Instead of coming out of the heavenly temple to cleanse the sanctuary of the earth, in 1844 Christ, for the first time, went into the heavenly Holy of Holies to cleanse it instead.
Another group of Millerites was influenced by Joseph Bates, a retired sea captain, who in 1846 and 1849 issued pamphlets insisting that Christians observe the Jewish Sabbath—Saturday—instead of worshipping on Sunday. This helped feed the intense anti-Catholicism of Seventh-Day Adventism, since they blamed the Catholic Church for changing the day of worship from Saturday to Sunday.
These two streams of thought—Christ entering the heavenly sanctuary and the need to keep the Jewish Sabbath—were combined by White, who claimed to have received many visions confirming these doctrines. Together with Edson and Bates, she formed the Seventh-Day Adventist denomination, which officially received its name in 1860.
Adventist Propaganda
White claimed to receive the first of several hundred visions in December of 1844. She gained recognition in Adventist circles as a prophetess and became the church’s leader. Over the next few decades, she provided guidance on almost every aspect of belief and worship, writing over fifty books commenting on health, education, finance, and other topics. Her works are held by her followers to be inerrant on matters of doctrine, as is the Bible, though they are on a slightly lower plane of honor than the Bible.
Her most important books, especially The Desire of the Ages and The Great Controversy, are frequently reprinted by Seventh-Day Adventist publishing houses in a variety of formats. They often appear with different covers and titles. For example, The Great Controversy is often marketed as America in Prophecy. They are printed whole or in excerpted form. Sometimes Ellen Gould White’s name appears on the cover, sometimes a less well-known form of her name appears (e.g., E. G. White), and sometimes her name does not appear on the outside of the book at all.
This allows Adventists to put White’s works in the hands of non-Adventists without alerting them that they are reading an Adventist publication until they are well into the work.
Adventist publishing houses also keep the terms "Seventh-Day" and "Adventist" out of their names. Typical Adventist and Adventist-related publishing houses have names including Inspiration Books, Amazing Truth Publications, Review & Herald Publishing Association, and Pilgrims’ Press.
This is because Adventists have always been regarded suspiciously by Evangelicals and have often been viewed as a fanatical cult (as have some of their offshoots, such as the Branch Davidians). Many Evangelical leaders even have asserted—incorrectly—that Adventists are not Christians, even though they believe in Christ’s divinity and use a valid Trinitarian form of baptism.
Often Adventist-related publishing houses conduct mass mailings of their literature to every home and post office box in a community. This has been done regularly with Amazing Truth Publications’ anti-Catholic volume, National Sunday Law.
Adventist Eschatology
Seventh-Day Adventism is basically consumed with the concept of the last days. It was formed from the remnants of the Millerite movement, which was created to await the world’s end. In White’s end times view, the Jewish Sabbath and the Catholic Church play prominent roles.
According to her, the papacy is the seven-headed beast from the sea in Revelation 13:1–10. Accompanying this beast is a lamb-like beast from the earth (Rev. 13:11–18). The latter causes the world to worship the former and has an image made of it. White proclaimed that the second beast is the United States (The Great Controversy, 387–8), and that it will force people to worship the papacy by "enforcing some observance which shall be an act of homage to the papacy" (ibid., 389). This observance, she says, is Sunday worship rather than Saturday worship.
White claims that the papacy changed the day of worship from Saturday to Sunday, making this change a mark of its authority. In her view, there will come a time when the United States will establish a "national Sunday law" and compel its citizens to worship on Sunday and thus take the mark of the beast. It will not compel them to become Catholics, but to join a Protestant state-church that is an "image" of the papacy, and thus, "the image of the beast" (ibid., 382–96).
Seventh-Day Adventism cannot change its views on the Catholic Church being the Whore of Babylon without admitting that it was wrong on Sunday worship. It cannot admit that Sunday worship is not the mark of the beast without changing its views on the Jewish Sabbath. Seventh-Day Adventism cannot cease to be anti-Catholic without ceasing to be Seventh-Day Adventism.
There is a "moderate" wing of Adventism that is more open to Catholics as individuals (though still retaining White’s views concerning the papacy). In fact, White was willing to concede that—in the here and now (before the end times)—some Catholics are saved. She wrote that "there are now true Christians in every church, not excepting the Roman Catholic communion, who honestly believe that Sunday is the Sabbath of divine appointment. God accepts their sincerity of purpose and their integrity before him. But when Sunday observance shall be enforced by law, and the world shall be enlightened concerning the obligation of the true Sabbath, then whoever shall transgress the command of God, to obey a precept which has no higher authority than Rome, will thereby honor popery above God" (ibid., 395).
Unfortunately, this one tolerant statement is embedded in hundreds of hostile statements. While this aspect of her teaching can be played up by her more moderate followers, it is difficult for them to do so, because the whole Adventist milieu in which they exist is anti-Catholic. The group is an eschatology sect, and its central eschatological teaching, other than Christ’s Second Coming, is that the Second Coming will be preceded by a period in which the papacy will enforce Sunday worship on the world. Everyone who does not accept the papacy’s Sunday worship will be killed; and everyone who does accept the papacy’s Sunday worship will be destroyed by God.