I am not an expert on J4J by any means and do not know what Orly Taitz considers herself either. What I am about to type here is simply how Christianity in the most general sense defines its own boundaries with Judaism and I hope it does not create any further controversy.
Just for the record, I will state what Christian theology (across all denominations) teaches, which is that salvation is not caused by obedience to written/oral Halacha (at least all of it). Christianity would say that people are allowed to abide by halacha as a matter of personal choice/conscience, but that they must NOT feel that they need to do so in order to go to heaven. Pheasant was correct that it is heresy according to the New Testament to preach that one must both believe in Jesus, and abide by all Mosaic Law, in order to be "saved".
Also, Christianity does not have a concept of one's Judaism ending. Christianity, at least in the ancient (NT) and modern sense (naturally, I am aware that medieval Catholicism and Lutheranism felt very differently about it, to say the least) has never demanded that anybody "stop being Jewish" so to speak. In Christian theology--please know I am aware that Jewish theology is diametrically different on this subject--it is entirely possible to be completely, even observantly, Jewish, and fully Christian simultaneously, noting the above (that one cannot simultaneously believe in Jesus and believe that obedience to all halacha is required for salvation). After all, virtually all of the Apostles and the earliest Christians were observant Jews.
One final note that may be a bit controversial--I do know a Jew who became a Christian who, prior to her conversion, was 100% secular and did not care about Israel or Judaism whatsoever, and probably never would have without doing so. She was not duped by J4J. I cannot speak for every single Messianic, but in her case I have zero doubt that her Zionism is real and is not just a ploy to seduce other Jews.
I really wish that Paulette had not brought up J4J at all, but I do still think she is a very valued Kahanist and member of our forum and hope that she returns. Otherwise, I'm done with this topic; anyone who wants my further input on it can PM me.