Again adding on some essential points I made earlier
here,....this debate will just keep going on in circles, since some like Jacob choose to remain 'Jewish' by observing the Torah and the prophets, while including Jesus as either the Jewish Messiah, or some Jewish prophet, so to some EXTENT acccept the NT, while some of these messianic groups will also accept Paul's writings or reject his gospel, depending on HOW they interpret his letters. So, its a "mixed bag".
This dialogue (or monologue?) with Jacob will just continue on in CIRCLES, unless specific points and relational concepts are considered and explored, as I've touched on, since PAUL complicates the matter and invents hiss own Gentile gospel,
BASED on his own personal revelation of Jesus, which is wholly
visionary (gnostic/spiritual), vouched in 'mystery-religion' terms, mythos and inner gnosis, since all that matters at the end of the day, is his own concept of 'Christ-crucified', focusing on a crucifixion-event (which seems to have no specific historical point in time necesarily, but that it occured to effect some kind of salvation), claiming it is in the 'scriptures' (but few OT scriptures are provided on that point, especially about a rising of this god-man on the 3rd day), and many other anomalies.
At the end of the day universal teachings of religious principle and spiritual ethics like taught in the Sermon on the Mount, and the Golden Rule, hold as universally relevant for all humanity, and the Shema centralized as the Law of LOVE, holds as what alone has true value for all, for Love is the Way, as the universal and spiritual law supporting the flourishing of LIFE. Jesus did say that the law shall never pass away until all is fulfilled, so that law if eternal and being the extended logos flowing out of God's own divine nature, it can never be annulled, neither can it pass away....but only fulfilled by love. Love for God and neighbor is the sum of the whole law, which the 10 commandments are a capsulation of.