I guess most of us bumble along in this life in terms of belief
about what happens after death. To start with, in terms of coming into the world, we had no choice, we were born into this life - it was thrust upon us. We might consider that a good part of our life's journey is happenstance. As we march each day toward our final day here on earth, we probably entertain a hope that maybe there is more to come, but always shelve that thought - it is, after all, beyond our experience.
What is certainly not happenstance is the Resurrection of Jesus. We are so used to hearing the Gospel accounts of Easter (though mainly that of John) that we can forget the very first written account was recorded at least 10 years before the first Gospel; that of Mark. Paul the Apostle handed on to his hearers 15 years before Mark's Gospel, what he had been taught by the first Apostles - probably within two years of the events of the first Easter. Five years later, he then provides a written account in 1 Corinthians 15:1-8. In those short eight verses is a remarkable account. Peter, and then the intimate group pf the chosen disciples (minus Judas) were the first to see the risen Lord, then the wider group of disciples numbering "over five hundred"! then James, then the 72 missionaries sent out in our Lord's time (known as apostles - lowercase "a" not the 12 - capital "A") which will have included by then Paul (James was executed by Herod - Acts 12:2).
In addition throughout Paul's epistles he spells out and makes clear what it is to live life in Christ. Paul makes it clear we are baptised into his death, and in so doing share his Resurrection.
We take this life for granted because we are living it - yet the whole of creation represents a miracle, and we are part of that miracle, but God has promised more and the pledge was the miracle of the resurrection of Jesus.
Alleluia, Alleluia, Christ is Risen, Alleluia.