Jews believe that Job is allegory. WT teaches that Job was a real person, a contemporary of Moses, from Arabia, a descendant of Abraham--but not of the 12 tribes. ( see Topic "Job" Insight Book and All Scriptures Inspired and Beneficial WTS.) If Job was a fictional character, then God did not actually use him.
If Job was a real person, then he was an exception of someone that God used who was not a Jew prior to "Pentecost".
Then, and as you say, if Job was a real person then your assertion is false that "Prior to Pentecost, God used the Jews exclusively."
The history of Job took place before God appointed Moses as his Messiah and before Israel accepted the Law covenant (according to WTS).
Another unevidenced assertion. Regardless, your earlier claims is already debunked if, as you say, Job was a real person.
Interestingly, God used Moses, a Jew, to write the book bearing Job's name, and people benefit because of Moses' work, not Job's.
Another unevidenced assertion. Regardless, your earlier claims is already debunked if, as you say, Job was a real person.
And then we have this gem:
Also, although Job's conduct and integrity must have given God much pleasure, God did not use Job or descendants as his "spokepersons". Prior to "Pentecost," God used the Jews exclusively.
How on earth you think you can prove the assertion that God did not use Job or descendants as "spokespersons" I have no idea, but I'll ask you to prove it.
And, finally, and as you say, if Job was a real person then your earlier claims is already debunked that prior to Pentecost God used the Jews exclusively.
