Here is a fantastic short video on Jҽωs for jesus. I highly recommend it. Check out minute 1:10 and 1:30, you will see images of the Jҽωs for jesus training manual, and you will see that types like this convert zeb are not friends of Christ. They scatter what Christ gathers.
This video calls them inverted marranos. Outwardly the marranos practiced catholicism, but inwardly at home went back to being Jҽωs. These Jҽωs outwardly practice judaism, but inwardly they try to be christians. Both are a fail and a damage to the church.
Here is my opinion of the matter. Judaism is the extremist of all extremist religions. However, they also have the capability of settling in between that extreme. And, that is where these Jҽωs for jesus fall in. However, Christ separates the sheep from the goats. And, these Jҽωs for jesus no matter their disposition, are not Christ. So, all of this is an abomination to Catholics.