Is the Gospel undefinable?

janxharris said:

We are enjoined to believe in Christ (John 6:26) and the essence of that belief is the Gospel. But is the Gospel clearly defined?

Paul speaks clearly in 1 Corinthians 15:1-11:

1 Now, brothers and sisters, I want to remind you of the gospel I preached to you, which you received and on which you have taken your stand. 2 By this gospel you are saved, if you hold firmly to the word I preached to you. Otherwise, you have believed in vain.

3 For what I received I passed on to you as of first importance: that Christ died for our sins according to the Scriptures, 4 that he was buried, that he was raised on the third day according to the Scriptures, 5 and that he appeared to Cephas, and then to the Twelve. 6 After that, he appeared to more than five hundred of the brothers and sisters at the same time, most of whom are still living, though some have fallen asleep. 7 Then he appeared to James, then to all the apostles, 8 and last of all he appeared to me also, as to one abnormally born.

9 For I am the least of the apostles and do not even deserve to be called an apostle, because I persecuted the church of God. 10 But by the grace of God I am what I am, and his grace to me was not without effect. No, I worked harder than all of them—yet not I, but the grace of God that was with me. 11 Whether, then, it is I or they, this is what we preach, and this is what you believed.​

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However, in Romans 9:10-24, Paul says something quite different:

10 Not only that, but Rebekah’s children were conceived at the same time by our father Isaac. 11 Yet, before the twins were born or had done anything good or bad—in order that God’s purpose in election might stand: 12 not by works but by him who calls—she was told, “The older will serve the younger.” 13 Just as it is written: “Jacob I loved, but Esau I hated.”

14 What then shall we say? Is God unjust? Not at all! 15 For he says to Moses, “I will have mercy on whom I have mercy, and I will have compassion on whom I have compassion.”

16 It does not, therefore, depend on human desire or effort, but on God’s mercy.17 For Scripture says to Pharaoh: “I raised you up for this very purpose, that I might display my power in you and that my name might be proclaimed in all the earth.” 18 Therefore God has mercy on whom he wants to have mercy, and he hardens whom he wants to harden.

19 One of you will say to me: “Then why does God still blame us? For who is able to resist his will?” 20 But who are you, a human being, to talk back to God? “Shall what is formed say to the one who formed it, ‘Why did you make me like this?’ ” 21 Does not the potter have the right to make out of the same lump of clay some pottery for special purposes and some for common use?

22 What if God, although choosing to show his wrath and make his power known, bore with great patience the objects of his wrath—prepared for destruction? 23 What if he did this to make the riches of his glory known to the objects of his mercy, whom he prepared in advance for glory— 24 even us, whom he also called, not only from the Jews but also from the Gentiles?​

What, exactly, are we being asked to put our faith in?
If the Gospel is undefinable and undefined, then is faith even possible?

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janxharris said:

Yet Calvinists are emboldened by such language - they still call themselves Christians and, when interrogated, their Gospel is found to be in complete opposition to the Arminian Gospel.

What's the unbeliever supposed to make of such confusion?

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janxharris said:

So to an unbeliever asking what the good news is, the response is that there's no consensus?

Isn't this shocking?

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