The GOSPEL is the most important thing. And the parts of the gospel that Paul called the things of most importance, are as follows:

"...the good news that I proclaimed to you, which you in turn received, in which also you stand, through which also you are being saved, if you hold firmly to the message that I proclaimed to you—unless you have come to believe in vain.

For I handed on to you as of first importance what I in turn had received:

that Christ died for our sins in accordance with the scriptures,

and that he was buried,

and that he was raised on the third day in accordance with the scriptures,

and that he appeared to Cephas, then to the twelve.

Then he appeared to more than five hundred brothers and sisters at one time, most of whom are still alive, though some have died.

Then he appeared to James, then to all the apostles.

Last of all, as to one untimely born, he appeared also to me."

I agree that the "heart of the gospel" as it has been called in one Bible version, has not been destroyed, so it didn't need to be reformed or restored.