Correct.

But even if we, or an angel from heaven, should preach to you a gospel contrary to what we have preached to you, he is to be accursed! ⁹ As we have said before, so I say again now, if any man is preaching to you a gospel contrary to what you received, he is to be accursed! Galatians 1:8-9 (NAS)

Why do you think it is against the will of God for a group decides to change the gospel or other parts of God's word to make them more pleasing to men, or to make people feel happy (or for any reason)?

Paul continues in that chapter (Galatians 1:10-12) saying:

For am I now seeking the favor of men, or of God? Or am I striving to please men? If I were still trying to please men, I would not be a bond-servant of Christ. ¹¹ For I would have you know, brethren, that the gospel which was preached by me is not according to man. ¹² For I neither received it from man, nor was I taught it, but I received it through a revelation of Jesus Christ. Galatians 1:10-12 (NAS)

The gospel taught in the New Testament is "not according to man," rather it was received from Jesus Christ.

No man is authorized to change God's words or God's prophecies:

"You shall not add to the word which I am commanding you, nor take away from it, that you may keep the commandments of the LORD your God which I command you." Deuteronomy 4:2  (NAS)

Revelation 22:18-19 "I testify to everyone who hears the words of the prophecy of this book: if anyone adds to them, God shall add to him the plagues which are written in this book; and if anyone takes away from the words of the book of this prophecy, God shall take away his part from the tree of life and from the holy city, which are written in this book." Revelation 22:18-19 (NAS)

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