Here's three skills that you must develop if you want to be more effective:
(1) Profiling Your Audience: Are they anti-Judaic? Pro-Judaic? Pro-Israel? Anti-Israel? Torah-positive? Torah-negative? Are they One-Law Inclusionists? That is, do they believe that non-Jews are members of Israel, compelled by the Ruach to learn and keep applicable commandments? Are they Two-Law Exclusionists? That is, do they believe that non-Jews are excluded from the People of Israel and only instructed to keep a second-class version of the Commandments?
Above all, understand that, by and large, the system of Christianities is anti-Judaic and thus will always reject the message of One Law--as a system. That said, there will be exceptions on the individual and congregational level.
(2) Calibrating to Your Audience: Don't explain One-Law to someone who is not ready. If it's a Christian, you might want to stay under the radar as much as possible unless they are very pro-Israel and acquainted with Jewish observances.
Example 1: I met up with a Christian friend recently who is very pro-Israel. He's a genius, legal background, oversaw Airforce J.A.G. core as a GS-15. So this was an individual with whom I felt comfortable sharing the One-Law message.
Example 2: I spoke recently with a Christian who runs a Messianic-styled fellowship at a church. I profiled him, found that he used to work with Jews for Jesus, that his mission is to host Messianic-styled services with the ultimate purpose of attracting Jews to Christianity. He was not anti-Judaic (in some ways) yet he was very Torah-negative. As a Dispensationalist he believed very strongly that the Law has been abolished. Against my better judgment I did engage him a little bit regarding the Torah-positive prophecies. But I kept things brief and very respectful, knowing that his background would ultimately prohibit him from accepting the One-Law message.
(3) Presenting to Your Audience: Here's a few things that can be included (depending on your audience):
- Establish credibility
- Talk about your experiences with Messianic Judaism
- Explain, if necessary, the history of the modern Messianic movement and how there are currently two camps within Messianic Judaism, One-Law and Two-Law, that One-Law teaches that the Covenant and Commandments are inclusive of non-Jews, that Two-Law teaches that non-Jews are excluded from the Covenant and relegated to a second-class version of the Commandments.
- Explain the history of Christianity, how it is historically supersessionist and inherently (perhaps inextricably) anti-Judaic. Explain why this is harmful. Explain why One-Law is beneficial.
- Explain key terms (e.g. Israel, Israel of G-d, Jew, Initiatory Circumcision, Ratificatory Circumcision, etc)
- State the positions of Christians and Messianics with regard to the Covenant and Commandments, briefly summarizing your opponents case.
- Make the case for One-Law: (1) make the claim that non-Jews are included in Israel and be able to state Scriptural evidence; (2) make the claim that the Ruach compels non-Jewish (and Jewish) Believers to learn about and eventually keep the applicable Commandments, citing to Scriptural evidence.
- Refute the opponent's position.
- Summarize your best points.
- Restate the benefits of your position, appeal to your audience's emotions (pathos), and make a call to action.