The story was about a rabbi (the author) who walked into a church. He'd been invited to give a lecture about Christian and Jewish approaches to the Bible. He writes:
The little episode shows that the Christian way of life is governed by the heart, not by an objective rule-based system. To be sure, Christians have their own set of limited rules. But it's not an all-encompassing system like the Jewish system. And the rule-averse ideology behind the Christian system makes it very unstable.
In the Jewish Way of Life, you're not allowed to simply interpret the Bible in the manner that "feels right" to you--in effect, to be led by your heart. This rule-positive system is therefore very objective. It's also based on the Bible. The result: a very stable system of halacha that has changed very little in the last 2000 years.
Now, with the recent Supreme Court ruling on gay marriage, a lot of Christian folks are upset but others very calmly say "the world is gonna be the world and the church is gonna be the church" (I think Bishop TD Jakes said that). The problem is that churches are not insulated from popular culture in the same way of halachic Jewish communities. Because they don't have all-encompassing rule-based systems that inform their way of life, their hearts often get the best of them. Case in point: many churches now welcome practicing homosexuals into positions of leadership. In other words, Christians should be very concerned about where popular culture is going because it's very likely that the next generation of Christians will see homosexuality as normative.
Normative uncertainty in Christianity will ultimately lead to Christianity's acceptance of secular cultural norms.
So, for Messianics, we must learn from the Jewish model. We need the secret weapon that combats moral relativism and normative uncertainty. We need a halachic system: only then will we our communities be able to promote (1) moral objectivism; (2) normative certainty; (3) long-lasting legal stability.
But to get there we must move beyond "being led by the heart". We have to embrace an ideology that Christianity disparagingly calls "legalism." And there will be 2 sides to a Messianic halachic system: (1) the laws themselves; (2) the meta-laws which explain how to recognize a law as valid. And the only way we'll achieve this is with Messianic Jews and non-Jews working together as one. Bipolar Theology (aka "Bilateral Ecclesiology) doesn't even want to provide a halachic system for non-Jewish Believers. The One Law movement is the only hope for viable Messianic halacha that informs the Way of Life for both Jewish and non-Jewish Believers.
May G-d have mercy on us and bless us with wise leaders so that we may know how to walk in the Way!