Joseph – you wanted to know how to mkarev this guy. Stabbing him and his wife with a spear isn’t going to do the trick. (Because he would be dead). It seems your real goal is how to force others to observe the Torah. Maybe you can try and get a Sanhedrin set up. Or you could try buying a spear and the rest of us will wait to read the headlines on YWN.
It’s 100% true that we someone shouldn’t marry a goy. And it would be wonderful if a beis din could take care of it. But they can’t. So we have to deal with the situation we are given. That doesn’t mean we tell people to intermarry. You could give shiurim about the halacha and hashkaficly of the Torah. You coudl daven that we should more clearly see Hashem and understand his Torah. I don’t see any more effective approach. We shouldn’t be like reform changing the rules and accepting what they do. But you asked how to mekarev someone intermarried. And that’s the question I’m trying to answer.