The Gospel is for all creation, literally; be it men, angels & those before His advent.

Christ would not have said to preach the Gospel (good news) to every creature (which means “all creation” or just simply, “all”) if the Gospel itself brings no “salvation” for them in the “end”.

Indeed, preach to “every creature” ( be it terrestrial or celestial – if He instructs you to do it- don’t falsely claim it in your flesh):

“And He (Lord Jesus) said to them, Go ye into all the world (terrestrial & celestial – earth & the heavens, in simple word), and preach the gospel to every creature.” (Mark 14:15)

Note that the “different gospel” (false gospel) is the one which contains in it the lie of the “bad news” (namely, eternal hell) because the criteria set forth to determine this is the phrase “which is no gospel at all”.

Can’t see it? Do allow me to make it ‘clearer’. The phrase “which is no gospel at all” (was used by apostle Paul to describe the false gospel) means as follows:

no gospel = no good news = has bad news too

Now,

True Gospel = no bad news at all = 100% good news = Christ saves all = doesn’t agree with criteria which apostle Paul set forth to identify the ‘false gospel’.

But,

Eternal hell gospel = has bad news = those who don’t believe will be fried “eternally” without any hope = agrees with the criteria of apostle Paul discussed above where the “false gospel” does NOT contain 100% good news = false gospel.

This is what you get when you take the verses of the Bible “literally” (no adding/removing nor confusing/twisting talk). Hope it’s “clear” now!

Here’s that verse “literally translated”:

“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 (anathema in Greek).” (Galatians 1:8)

The part where it says “no gospel at all” is described in the verses below:

“6I am astonished that you are so quickly deserting the one who called you to live in the grace of Christ and are turning to a different gospel— 7which is really no gospel at all. Evidently some people are throwing you into confusion and are trying to pervert the gospel of Christ.” (Galatians 1:6 – 7)

P/S:

The effect of all creation being saved in the “end” is described “literally” in the verse below:

“that also the creation itself shall be set free from the servitude of the corruption to the liberty of the glory of the children of God.” (Romans 8:21)

This is “why” Lord Jesus Christ is exclaimed to be the “Saviour of the World”, namely because He will save the world (all or creation) in the end, literally, as the verse below bears the testimony of the apostles as they declare this same truth, collectively (we):

“And we have seen and testify that the Father has sent his Son to be the Savior of the world.” (1 John 4:14)

Lastly:

Kings who fought for their race were great.
Kings who fought for their nations were legendary, but The King Who fought for the reconciliation of All is Mythical.