The example being discussed was a Jew who converts to Christianity. AFAIK, Christians don't believe in Sheol and according to a word search I did, it's not mentioned in the KJV.
If a Jew adopts Christian beliefs, then he must accept that there is only one way to escape eternal damnation, yes?
Given that Sheol is Scriptural, why wouldn't a Christian believe in it?
If a Jew adopts Christian beliefs, then he must accept that there is only one way to escape eternal damnation, yes?
Through Jesus Christ, yes.
But if you are ignorant of His message through life, it is not the same thing as consciously rejecting Him. Natural Law put it quite succinctly:
Loss of salvation requires a conscious rejection of Christ. This requires a knowledge of Christ. The innocence of invincible ignorance mitigates this. Imputability and responsibility for an action can be diminished or even nullified by ignorance, inadvertence, duress, fear, habit, inordinate attachments, and other psychological or social factors.