Sadly, there are many Jewish converts to Christianity or "Messianic" Jews. Far too many. Millions upon millions of dollars are spent on this yearly. The common denominator of virtually all of them is that they never received a proper Jewish education. Just about nobody with a decent education ever converts. That is why this is a non-issue for most of us - we don't have friends who converted because the people we associate with are Jewishly educated.
I was reading the account of a Jew with a very Jewish name who described how he converted. He said that he was down and depressed when he met some missionaries. They convinced him that they were correct when they showed him the 53rd perek of Yeshayahu and based on that he converted.
That was so puzzling. The perek never says that Yoshke is Moshiach. It never says that he is G-d. It never says that Hashem changed his mind and rejected the Jewish people. It never says that one need not keep Torah law anymore. Nothing about a virgin birth. Nothing about a second coming. Just a story about a suffering servant . How does that prove Christianity? Lots of people have suffered over the centuries!! Based on the nonsensical and baseless assumption that the perek refers to Yoshke he converted.
How sad.
May Hashem remove all of our fallen brothers and sisters away from the tumah and help them return back home.
