I’ve always wondered how that was supposed to work … floating in ‘Limbo,’ maybe? Obviously, early modern humans, such as Cro Magnons don’t count..

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The clearest answer I know is tradition related to Dante's Divine Comedy, that the unlearned and the virtuous pagans are in the first circle of Hell. This is also known as Limbo, which lacks the active suffering of Purgatory, the "punishment" passively being absent from God's presence and active grace.

According to what I was taught. They are "sleeping", in an inbetween state (not purgatory. Thats catholic & they are idol worshippers). At the 2nd coming, they will ascend & can decided between heaven or hell.

And also, how 'bout other people who are not believing in Jesus Christ? Those Buddhist for example...