This guy lived over 600 years before Jesus....he, like Jesus, was a Hebrew.
Hebrews were not Christians despite trying to link them and later usurpers of their religion.
Who said he was a Christian?
Also, are you suggesting that Isaiah, whom Christ and almost every New Testament writer quoted, was not saved like all Christian? Or that what he wrote is not beneficial to Christians?
Well I will use your particular identifying word Hebrew as that is what Abraham was called to refute your claim.
Where was Lazarus found? Wasn't it in Abraham's bosom? And according to Peter, Christ upon death of the flesh went first to those 'spirits' held in prison since the days of Noah to offer them first salvation. People are certainly free to believe whatever they want but that does NOT mean it is scriptural.
It is written that the 'saints' upon overcoming sing the song of Moses and aren't the Christians the ones who recognize that term 'saints'? Now why would Christian saints be singing the song of Moses IF Moses is not Christian?
There is only one named entity that will never be offered life eternal as he has already been sentenced to death and there is a numbered of his direct followers who refused to be born of woman that are also noted that will receive the death sentence. Other than that any who are born from above have met the first requirement to 'see' the kingdom of God.