Galatians 1:8-9 :
But even though we, or an angel from heaven, should preach to you any “good news” other than that which we preached to you, let him be cursed. As we have said before, so I now say again: if any man preaches to you any “good news” other than that which you received, let him be cursed.
It is a grave error to preach a perverse gospel. In these verses, Paul calls a curse of eternal punishment on anyone who would attempt to preach a different gospel than the one He preached!
Not only did Paul curse once, but he cursed twice. If you are looking for black and white in our world, here it is. The Gospel of Jesus Christ is not anything that can be modified, altered, or replaced. You either believe it as it is, or you leave it and face the consequences. There is no room for argument here in regard to Christianity.
Now, just in case you don’t notice how important this is, Paul calls the curse upon himself, the Apostles and the angels if any of them should attempt to preach something else! Hearing an angel, as some claim, is not good enough reason to give the gospel an update! Even if someone claims to get a message from Paul, and it disagrees with what is written here, you are obligated to reject it. Need I say that this includes any teacher alive today and ever since then as well?
No, the good news of Jesus Christ cannot “evolve.” It’s perfect and complete. Now God could have written anything and we would have had to accept it. Thanks to Him, He wrote down “good news.”