Where does the Bible say that unbelieving Jews are his chosen people?
The Jews were God's chosen people because.
They were not chosen for their faithfulness to Him, and they were not unchosen because of their lack of faithfulness.
The physical descendants of Abraham are, always were and always will be God's chosen. Because it's about God's choosing and HIS faithfulness, not them being faithful.
His word about them is irrevocable.
Where does the Bible say that unbelieving Jews are his chosen people?
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Who says all Jews are “unbelievers?” All religious Jews “believe in” Messiah. They also know that Jesus existed. They just don’t believe that Jesus was that Messiah, though many have had a change of heart.
Most Christians don’t believe they are obligated to obey Torah yet God says he will write it on our hearts. Unbelief goes both ways. Paul stated that we see through the glass darkly.
All will now the knee to Messiah.