1. What is the purpose of the book of Job? Am I to understand that God is willing to allow Satan to inflict torture as a test of faith? Does God consider Job's family to be acceptable collateral damage in Job's test?
The book of Job is interesting in that Job starts off blaming Satan for all his troubles, but the book ends with Job’s friends “comforted and consoled him over all the trouble the LORD had brought upon him.” Also, it is interesting to note, reading between the lines, that Job’s wife wanted him to die so that she could move on. But, there are many purposes: God hasn’t abandoned you just because trouble comes into your life, so don’t abandon God...Satan has no power over you and thus we shouldn’t glorify Satan by blaming him for our troubles, etc, etc, etc. And God is more than willing to take the lives of people, who are going to die someday anyway, in order to provide examples that will encourage us to seek eternal life.
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2. Is it possible that God revealed Himself (using the traditional form of Him) to other cultures around the world alongside his revelation to the members of the tribe?
Yes, he did so to the “wise men” who came to worship the baby Jesus...but whatever wisdom God gave them led to them finding Christ.
In otherwords, can there be other paths to Heaven/salvation/glorious afterlife (supposing, as I do, one exists) aside from Christ?
The bible is extremely and repetitively clear on this – since the beginning of the church age, Christ is the only path to salvation, and the Old Testament is in agreement with this.
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3. Are the moral prohibitions of the Bible absolute? I mean, can some of the prohibitions merely be a set social/dietary etc regulations for the time--created for reasons other than they displease God--that don't apply today? If some prohibitions are no longer in effect or applicable, what are they? Can you give some sort of brightline rule as to what still applies and what does not, and why?
There are many laws that have changed, been added, and/or removed. Some of the law changes had to do with the initial state of things, but there were major law changes put in place when Noah left the Ark, another major law change when the Jews left Egypt, another change when Christ died, and there will be another change when Christ returns...but, basically, if you go by the New Testament and use the Old Testament as a contextual backdrop (which the New Testament quotes from 100’s of times as a contextual foundation), then you’ll be on solid ground.
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4. Assuming an afterlife exists, and one has done what you think they need to go to go to Heaven
You have to believe in Christ, repent of your sins, receive the Holy Spirit, and live a life by faith..
, what happens when he or she dies? Is there an indeterminable period of sleep/unconsciousness until the final judgment (if one could perceive that at all)? Straight ticket to the pearly gates after instant judgment? Purgatory?
I think it is a state of sleep for the saved, until the return of Christ...though I have no problem with those who believe you immediately are conscious in Heaven.
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5. Describe God...is He (the traditional pronoun here) omniscient, omnipotent, omnipresent? Some of these things? None? Is He solely a force for good? Does He have a beard? Does He play Skeeball down the Jersey shore?
He is spiritual being who has always existed, and who fills the universe and is outside of time.... omniscient, omnipotent, omnipresent all apply.