My summary of the central message of Christianity (kerygma)

"The basic curricula of the kerygma emphasizes that Jesus is the chosen Messiah of God, the one who was promised. And though he was crucified, He rose gloriously from the dead, appearing to his disciples, and having been exulted at the right hand of the Father through his ascension, now summons all to him, through the ministry of the Church. This proclamation (kerygma) requires a response from us, that we should repent of our sins accept baptism and live in the new life which Christ is offering. This alone will prepare us for the coming judgment that is to come upon all humanity. There is an urgent need to conform ourselves to Christ and be prepared by him for the coming judgment. This was the basic Kerygma. "
https://blog.adw.org/2012/10/what-do-we-mean-by-the-term-kerygma/
In this current climate and context, there are some who argue for a return to basic apostolic preaching as a fundamental schema in speaking to an unbelieving world. Deeper doctrines can and should be enunciated later but the initial proclamation should stick to basics:
"That we are lost in our sins, that those deep drives are destroying us, and that God has sent the Savior, Jesus Christ, who died to set us free and offer us whole new life. It is he who calls to you now, who is drawing you to himself, that he might save you and give to you a whole new life. He died to give you this life, and having been raised from the dead, he ascended to the Father, where he is drawing you to himself even now, calling you by name, and offering you deliverance from every sinful and destructive drive, establishing you in a new, more glorious, and hopeful life. Come to him now, the repent of your sins, and let him begin the good work in you.

This is the basic Kerygma. It is the starting point, the initial proclamation, the summons, the invitation: the conviction of sins, but the announcement of loving hope..

There are eight kerygmatic sermons set forth in the Acts of the Apostles. In tomorrow’s blog post I would like to explore each of these sermons, and extracted their basic details. Today for the sake of brevity, let this be enough, to introduced the concept of what we mean by kerygma."
https://blog.adw.org/2012/10/what-do-we-mean-by-the-term-kerygma/
Additional reading on this
https://blog.adw.org/2012/10/what-do-the-kerygmatic-sermons-of-acts-have-to-teach-us-about-the-new-evangelization/
https://blog.adw.org/?s=Kerygma