Galatians 1:7 Which is not another; but there be some that trouble you, and would pervert the gospel of Christ.
Galatians 1:8 But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed.
How can someone pervert the gospel of Christ? By adding to it or taking away from it. Verse 8 tells what happens to anyone that adds to or takes away. They are accursed. NOT GOOD. Paul says in Romans 9:3 that he would be accursed for his kinsmen (Israelites) if they would just believe the gospel of their salvation.
For I could wish that myself were accursed from Christ for my brethren, my kinsmen according to the flesh:
He (Paul) was willing to be separated from Christ so they would be saved. (I don’t know how much you would have to love someone to be able to wish that.)
If an angel from heaven came and gave you personally a gospel would you believe it? Verse 8 says NO! How many denominations today are following an individual that says they got a message from an angel? There are several. Paul tells us that the Satan today is an angel of light and has his own ministers of righteousness.
2 Corinthians 11:14 And no marvel; for Satan himself is transformed into an angel of light.
2 Corinthians 11:15 Therefore it is no great thing if his ministers also be transformed as the ministers of righteousness; whose end shall be according to their works.
God feels so strong about this that He had Paul say it again in verse 9.
Galatians 1:9 As we said before, so say I now again, If any man preach any other gospel unto you than that ye have received, let him be accursed.
Be careful not to follow after man, follow what God has said to us in His perfectly preserved Word.
Grace and Peace