I am trying to understand your position here, Iconoclast, not debate it. My definition does not matter here.
I understand "Calvinism" to be the "Doctrines of Grace" often articulated by the acronym "Tulip".
You said that Calvinism is the gospel.
I am asking if it is "another gospel" or the gospel that is the power of God to salvation?
I think you realize even defining 'gospel' is going mean different things to different people who hold on to different ideas.
Some are heretical as in they set themselves apart from what God says is the gospel.
Paul declares that this is the gospel
1 Corinthians 15 New King James Version (NKJV)
1 Moreover, brethren, I declare to you the gospel which I preached to you, which also you received and in which you stand,
2 by which also you are saved, if you hold fast that word which I preached to you—unless you believed in vain.
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For I delivered to you first of all that which I also received: that Christ died for our sins according to the Scriptures,
4 and that He was buried, and that He rose again the third day according to the Scriptures,
5 and that He was seen by Cephas, then by the twelve. 6 After that He was seen by over five hundred brethren at once, of whom the greater part remain to the present, but some have fallen asleep. 7 After that He was seen by James, then by all the apostles. 8 Then last of all He was seen by me also, as by one born out of due time.
As you can see, 3 things are the gospel by which means you are saved.
a. Christ died for our sins according to the Scriptures
b. He was dead and buried and He rose again alive on the 3rd day.
c. People saw Him alive after His death, this was witnessed by many people.
When you receive that , holding it fast to yourself as true, then you are saved.
Dont add on other requirements for something to be the gospel.
The big part of where people differ is who Christ died for, did Christ die for unbelievers or did Christ die for believers, how do people define the 'Christ died for our sins'.
Calvinists always use the scriptures to back up their claims, He died for our sins according to the scriptures, so we always must be in agreement with what scripture says about whom He died for.
An example is Christ says this
John 10:15 As the Father knows Me, even so I know the Father; and I lay down My life for the sheep.
John 10:11 I am the good shepherd. The good shepherd gives His life for the sheep.
John 10:26 But you do not believe, because you are not of My sheep, as I said to you.
John 10:27 My sheep hear My voice, and I know them, and they follow Me.
Hebrews 13:20 Now may the God of peace who brought up our Lord Jesus from the dead, that
great Shepherd of the sheep, through the blood of the everlasting covenant,
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make you complete in every good work to do His will, working in you what is well pleasing in His sight, through Jesus Christ, to whom be glory forever and ever. Amen.
So we see if you dont believe, this is because you are not one of the sheep, and so then Christ did not give up His life to save you and give you eternal life.
And Christ is the great Shepherd of the SHEEP only, not the shepherd of those who dont believe. And the shepherd gives up His life for the sheep. When you add on Christ died for those who are not the sheep, you are adding on to the gospel.