To remain Jewish in the Celtic sense and in a cultural sense after the Resurrection of Our Lord is to deny Our Lord.
To remain Jewish to this day, while admirable in the putrid tenacity, is to order your life in opposition to Our Lord.
The traditional Catholic view, any my view, is that Our Lord rose a people unto Himself to prepare a way for His arrival. In short, they were intended as a prepatory people. Holy satchel-carriers. They had a pedestrian ministry and they claimed more than was meant for them.
There is no connection to the contemporary people, who despise Our Lord, and the Jews of the Old Testament who prayed through angonised tears of longing for the coming of the Messiah. To think otherwise is to harbor a doubt of Our Lord, at least in some measure, in your own heart.