He knew this because their (Jewish) gf’s buddies and parents disapproved of him. We explained why these individuals would not disapprove of him because he had been a Christian dating a Jew, which is another issue altogether because he was Christian; they disapproved of him.
Traditional Judaism will not allow interfaith marriages. The Torah states that the young kids of these marriages could be lost to Judaism (Deut. 7:3-4), and experience indicates the reality for this passage all too well. The 2000 nationwide Jewish Population Survey discovered that just a 3rd of interfaith couples raise their children Jewish, despite increasing efforts into the Reform and Conservative communities to welcome interfaith couples, and that statistic has not changed, based on a 2017 report. […]