That Christ died, was no out of the ordinary event. That he returned from the dead was an extraordinary event, and indicates that there is indeed life after death.
If someone believes then the belief in a soul and/or afterlife is not a problem. I'm by the way also able to explain that an afterlife is possible in case a soul is not existing. Christians believe in a surrection of a [transformed] body - so there's no need to separate body and soul.
read the accounts of the 2 formerly dead priests that returned with Christ,
What? Two formerly dead priests? Never heard anything about.
and gave testimony to the events,at the Temple, you'll see that just like the Bible describes, those men were alive and well, absent from there terrestrial shells, and were waiting in Abraham's bosom for the appearance of Christ. Those souls could not enter heaven until pure blood was shed for their sins. Aprox. 10,000 souls, reunited with their (glorified at that point) bodies, returned with Christ, and ascended with him 40 days later.
A strange story that seems to be important for you. In our tradition we pray 40 days if someone dies. So we accompany a beloved dead person with prayers and this helps to find orientation - as well for the dead person with the lights of our souls - as well for us ourselve in our concrete life here, because it minimizes normally our suffer to be able to help. For sure best wishes and the will to help are never wrong - even if someone is not able to believe in such stories.
The following ritual shows how we bury our highest political authorities - the german emperor who lived in Vienna before Napoleon destroyed the holy empire. Because of Napoleons attacks he was only the Austrian emperor any longer. Someone knocks in this ritual three times. A monk asks "Who is there?". Later 2 times is the anwer "We don't know him" and the last answer is to open the doors. The text starts after the first knocking with all international titles and mights and honors - reduces after the second knocking to the personal name and title - and ends after the third knocking with the forename and "
a poor sinner". That's what we are - everyone of us - without any exception. Poor sinners. Everyone needs the grace of god.