If a Jew after stating,
Deuteronomy 6:4, "Hear, O Israel: The LORD our God, the LORD is one" and then asked, do you agree? Could you agree and leave it? Most Trinitarians won't leave it.
And attempt to convey nobody before the coming of the Messiah was saved as if soteriology differed between the Old and New Testaments. There has always been a faithful remnant of Israel, our translations term them saints in the OT. Hebrews 11 the hall of faith lists the many faithful persons throughout the OT. Sometimes we forget, the OT authors were too Jews before the birth of Jesus and were among the faithful remnant of Israel.