2,000 ago Jesus said,
Matthew 7:15 / Watch out for false prophets. They come to you in sheep's clothing, but inwardly they are ferocious wolves.
Then, who is false prophets?
Ezekiel 22:26~27 / Her priests do violence to my law and profane my holy things; they do not distinguish between the holy and the common; they teach that there is no difference between the unclean and the clean; and they shut their eyes to the keeping of my Sabbaths, so that I am profaned among them. Her officials within her are like wolves tearing their prey; they shed blood and kill people to make unjust gain.
In other words, false prophets is all prophets who don't keep God's Sabbath.
And the false prophets slanders World Mission Society Church of God, keeping God's Sabbath.
We can know God's will through Bible. Even if false prophets and slanderer slander World Mission Society Church of God, World Mission Society Church of God, following God's laws don't fail.
Acts 5:38~39 / Therefore, in the present case I advise you: Leave these men alone! Let them go! For if their purpose of activity is of human origin, it will fail. But if it is from God, you will not be able to stop these men; you will only find yourslves fighting against God.