>This is underlined by Matthew 25 when it says people will go into everlasting punishment and life eternal.
Everlasting punishment = everlasting death. The historical Jesus, being a good Jewish man from the pharisaical tradition, would not have had any notions about a spiritual afterlife. That was a gentile thing, not a Jewish thing. For Jesus, being dead meant being dead. The only way to have a second chance at life was to be resurrected. There was no immortal soul in his theology. Hence "everlasting punishment" means being dead forever.
>Sure, but there's no way to demonstrate any are authentic, so you're left with just what the text says. And it says that Jesus of Nazareth introduced these ideas in the actual text.
There's a whole school of scholarship dedicated to evaluating which sayings are more or less likely to have come from the historical Jesus. One such attempt:
https://www.amazon.com/Five-Gospels-Really-Search-Authentic/dp/006063040X
Maybe? I dunno, I'm not a biblical scholar, I know what I know from a historical perspective. That sounds Old-Testamenty, anyway, which largely only pertains to pre-Rabbinic Jewish tradition/Judaism of Antiquity, and trying to literally interpret the Bible, especially the Old Testament, without context can basically be used to justify anything.
tl;dr fucking house motherfucking rapists, this isn't hard. You're protecting life.
If you want a really studied interpretation of the New Testament, check out The Five Gospels. It's what happens when you get a hundred historians and religious authorities and skeptics, Christian and Jewish, to dissect the teachings of Jesus, or rather, what was written of the teachings.