When you and other orthodox Jews stop calling secular Jews, "Jews" then you might have a case.
Jesus was Jewish, the 12 Apostles & Saul/Paul: Jewish. The writers of the 27 New Testament books, with one exception: Jewish. There were at least a dozen Jewish sects in the 1st Century, and what became called "Christianity" was one of them (originally called "the Way" or the "followers of the Nazarene"). It just happened to be far more successful in appealing to Gentiles than any other sect.
Despite the conflicts between ethnically Gentile Christians and ethnic Jews through the centuries, Christianity is a profoundly Jewish religion.
Leadership in modern Messianic Jewish congregations are ethnically Jewish, know Hebrew, and usually have many years of training--and are not "self-righteous chameleon Christians putting on a yarmuke...."
The ONLY group of Jews consistently singled out by Orthodox Jews as NOT Jewish, are not the atheists, or agnostic left-wing anti-Israel traitors to your faith--just those who think the claims of a Jewish carpenter 2000 years ago were true. THAT kind of prejudice should stop.
Look at how ashamed you are to call yourself a Christian... Says it all. Truly this is your least Jewish attribute - your shame. Alas surely you are more Jewish and Christian than I, and more of everything than anyone else, and that’s the way it stands, master of scripture and child of lonely interpretation.