Did you read the article you posted? It says:
Neither is the issue that "Jews for Jesus" is somehow a "cult,"
The writer of the article is not exactly coherent. For example, compare the following two statements:
What ultimately makes a Jew is faith, not background.
Jews that leave Judaism by accepting another religious belief system have always been historically referred to as "apostate Jews."
So the question for the confused author would be: If one cannot be a Jew unless he is a religious Jew, how then can one be an apostate Jew?
The article is full of finger-pointing nonsense. JFJ must be fairly effective to incite all this panic.
The author does not claim that Jewishness resides in ones adherence to all of Jewish law. It does say that an apostate Jew can no longer claim to be a Jew.
What is incoherent is the attept to state the opposite of what is obviously true in the two statements you cited.
The article is full of finger-pointing nonsense. JFJ must be fairly effective to incite all this panic.
The article indeed points fingers. However, Jews for Judaism, because of the millions of dollars the Baptist Church has pumped into this organization has indeed got the attention of the Jewish world. You might call it "effective", others would call it destructive.