Do Young-Earth Creationists Proclaim a False Gospel?

The Gospel as it is proclaimed in the New Testament nowhere mentions the process whereby God created. It is never presented as a part of the Gospel message proclaimed by Christians in any way, shape, or form. It isn’t that it is “just a minor tenet” or something like that – it isn’t mentioned at all.

People held all sorts of views about the process of creation and the nature of the natural world in those times. And yet we have no record of any Christian proclaiming to pagans to believe different things about the makeup of the natural world, or anything else of that sort. Belief in God as Creator seems to have been enough for them.

So does that mean that modern young-earth creationists, who emphasize specific beliefs about the process of creation as part and parcel of the Christian Gospel, and who accuse those who disagree with them of distorting the Gospel, are themselves heretics who preach a false Gospel? Does it not at the very least indicate a profound confusion and misunderstanding on their part about what the Gospel is, and a lack of comprehension of, if not indeed lack of interest in, what the New Testament actually says?