The SDAs observe what is called "Sabbatarianism", which is an extreme view of observing the Saturday Sabbath, with even salvation depending upon it. This view is the source of the cult's name!
This view is wrong. First, the Sabbath was given ONLY TO ISRAEL, and we see in Scripture that God didn't punish any gentile for not observing it, unless that gentile was leading Israelis to break it. And we see in old jewish writings that the old Israelis forced the Gibeonites & other gentiles who were their forced servants to perform their labors on the Sabbath, such as animal husbandry, cooking, cleaning, wood-cutting, etc.
But again, God has never required non-Israelis to observe the Sabbath, In fact, He said, thru Paul, in Col.2:16"Therefore no one is to act as your judge in regard to food or drink or in respect to a festival or a new moon or a Sabbath day"
(Remember, Paul was writing to gentile Christians in Colossae, a Roman city in present-day Turkey. It was famous for an angel cult.)
The SDA also falsely asserts Sunday worship is the mark of the beast, a view not found in Scripture whatsoever, & therefore completely-false !
AND CERTAINLY, JESUS NEVER MADE SABBATH-OBSERVING A CONDITION FOR SALVATION !
Just a continuation of the fact that SDA "has a FORM of godliness while denying its POWER" !
Regardless of your religious affiliation, NEVER believe ANY MAN-MADE doctrines or rules of faith/worship ! Instead, let SCRIPTURE, free of any man-made interps, be your guide!