The Good News
As stated by the Catechism of the Catholic Church is as Fallows:
The Good News: God has sent his only Son
422 'But when the time had fully come, God sent forth his Son, born of a woman, born under the law, to redeem those who were under the law, so that we might receive adoption as sons.'1 This is 'the gospel of Jesus Christ, the Son of God':'2 God has visited his people. He has fulfilled the promise he made to Abraham and his descendants. He acted far beyond all expectation - he has sent his own 'beloved Son'.
It is easy to suggest that Christ came to die for us, he did not, this was a unfortunate situation made necessary by our sins. The fact that Christ sacrifice was predestined and unavoidable because of our making it so does not change the fact that Christ having to die was on us, not him. Christ came not to die for us, but to give himself to us fully as he did. Although his sacrifice on teh cross was our Redemption and his reserection our Justification, these things are the ways the Good News which was the Incarnation carried out his mission. Surely it is not Good News that we (Yes, you and I) made his sacrifice necessary.
Again from the CCC
425 The transmission of the Christian faith consists primarily in proclaiming Jesus Christ in order to lead others to faith in him. From the beginning, the first disciples burned with the desire to proclaim Christ: "We cannot but speak of what we have seen and heard."'11 It And they invite people of every era to enter into the joy of their communion with Christ:
Then the wisdom of the Church, quoting 1 John in the same section of the CCC.
That which was from the beginning, which we have heard, which we have seen with our eyes, which we have looked upon and touched with our hands, concerning the word of life - the life was made manifest, and we saw it, and testify to it, and proclaim to you the eternal life which was with the Father and was made manifest to us- that which we have seen and heard we proclaim also to you, so that you may have fellowship with us; and our fellowship is with the Father and with his Son Jesus Christ. And we are writing this that our joy may be complete. (1 Jn 1:1-4)
This is the Gospel. The Incarnation, God amoung us. When you consider how the Creator of the Cosmos took on human flesh, humbling himself to be a helpless infant in the hands of a human woman, saved by her! Yes, protected and saved by Mary and Joseph together from the hands of Harod and other trials of this vail of tears, humbled all the way to death and then at the end, when Christ could not humble himself any more in our eyes. Testing our faith and understanding of how amazing our God is, he became at the hands of our Priests, that which was once formally and now resembles Bread and Wine.
God with us Still.