The word of God is absolute truth.
God's word for our salvation is important. Even a small word of faith that is absolutely obedient can lead to salvation. That is why we must abandon our thoughts and obey all the laws God has ordered us to do. Often people think that they are better, and they do not do what they have given them on the pretext of fulfilling their loyalty to God, but make an error to match God's thoughts as they wish.

Revelation 22:18–19
I warn everyone who hears the words of the prophecy of this scroll:
If anyone adds anything to them, God will add to that person
the plagues described in this scroll. And if anyone takes words away
from this scroll of prophecy, God will take away from that person any share
in the tree of life and in the Holy City, which are described in this scroll.

All of the words God gave through the Bible for our salvation are important. We should not add my thoughts to the Bible, nor subtract the words. The Early church observed the Sabbath and Passover, never observed Sunday services and Christmas. That's because there was no Sunday and Christmas in God's Word. God recorded the Bible so that we could receive forgiveness and enter heaven. So he repeatedly emphasized, "Don't add or subtract anything from the words of the Bible.
The Church of God keeps the Sabbath and Passover as the Bible says, and believes in God the Father and God the Mother. The Church of God is the only church on earth that believes and practices as the Bible says.