Yes, they try to teach this. They have to reach back and grab some OT lingo and put a symbolic spin on it and presto! They think there is another way to get saved other than through the blood covenant. Only trouble is NT theology talks about "one new man" not two:
Eph. 2: 12 - you were at that time separated from Christ, alienated from the commonwealth of Israel and strangers to the covenants of promise, having no hope and without God in the world. 13 But now in Christ Jesus you who once were far off have been brought near by the blood of Christ. 14 For he himself is our peace, who has made us both one and has broken down in his flesh the dividing wall of hostility 15 by abolishing the law of commandments expressed in ordinances, that he might create in himself one new man in place of the two, so making peace,