“Most modern Jews never rejected Christ.”
All modern Jews, except maybe for one on a deserted Island somewhere, has heard of Christ and has not converted. The scripture makes no exceptions for ignorance (even for the one on the island), prejudice or any other form of foolishness. Nor does it require that one specifically reject Christ to be damned. The scripture merely teaches that those who do not believe in Christ, are condemned already.
“All modern Jews...has heard of Christ and has not converted.”
They have heard of Him, but have never been preached to. There’s a huge difference. They hear things about Jesus, but they have not heard the gospel of Jesus. There’s a difference.