I don’t quite get the argument here; doesn’t anthropic shadow imply we have nothing to worry about (except for maybe hyperexistential risks) since we’re guaranteed to be living in a timeline where humanity survives in the end?
But it doesn’t say we’re guaranteed not to be living in a timeline where humanity doesn’t survive.
If I had a universe copying machine and a doomsday machine, pressed the “universe copy” button 1000 times (for 2¹⁰⁰⁰ universes), then smashed relativistic meteors into Earth in all but one of them… would you call that an ethical issue? I certainly would, even though the inhabitants of the original universe are guaranteed to be living in a timeline where they don’t die horribly from a volcanic apocalypse.
I think the bigger problem with the argument is: if Jesus rose from the dead for the same reasons that a randomly-selected human would, then Jesus is just an arbitrary human who got lucky, and mainstream Christianity is false. So if you’re invoking that to try to estimate whether Christianity is true or not, you’re clearly asking the wrong question.