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>> “If nobody is saved until they die, then there aren’t any true believers” <<
That is nonsense.
You’re looking for an unconditional guarantee, and no such thing is offered.
The scriptures make it plain that the only path to eventual salvation is endurance in the faith Yehova offered in the covenant at the first Shavuot at Sinai.
His son came to revive it, and provide the promised perfect sacrifice.
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You popping in Roodian posts reminds me of that scene in Caddy Shack, of the Baby Ruth in the swimming pool, only it isn’t a candy bar in this case.
Of course it isn't offered. If it were offered, it would be a work in accepting the offer.
It's the call of the elect and how one responds which allows our faith to be efficacious for His gracious gift of salvation.