That is rather strongly worded. I am OPC Presbyterian, and I have spent many a day of fellowship with my SDA friends. And I am a sabbatarian who disagrees with YOU for not obeying the commandment of YHWH to observe the Sabbath, and who also disagrees with THEM for gathering together on the Sabbath Day.
They believe the revelation and inspiration of both the Bible and Ellen White's writings to be of equal quality.
Baloney. I wholly agree with you wrt Hellen White, and hold their elevation of her as a prophetess against them. But by my experience, they do *not* hold her prophecies to be equal to the Word. In fact, this has been a common argument between us.
IMO, It would do you good to have a conversation with the folks you so readily condemn.
The adventists DO hold White's prophecies to be equal to scripture. They made this statement in their "Ministry" Magazine of Oct. 1981 and have never retracted it: "We believe the revelation and inspiration of both the Bible and Ellen White's writings to be of equal quality. The superintendence of the Holy Spirit was just as careful and thorough in one case as in the other".
They won't tell you too much about Ellen G. White at their public seminars, but their goal is to bring the person attending to the point of conversion and baptism. Their 2000 baptismal certificate poses questions to which the candidate must answer "yes". Question 8 says,
"Do you accept the biblical teaching of spiritual gifts and believe that the gift of prophecy is one of the identifying marks of the remnant church".
If the candidate says "yes" and is baptised, they soon learn that the "gift of prophecy" is Ellen G. White's writings. Point 13 has them accepting that the SDA Church is the remnant church of Bible Prophecy
These are a cult and you going with them puts your soul in danger.