I agree with your premise that God did away with circumcision... But nowhere does Scriptures alone lay out God's will in doing this. It is only Acts 15:28 that makes this declaration - after the fact... A Judaizer will look in vain to the Old Testament to find this "command of God". One must look to the New Covenant, which revolves around FAITH. Without faith, one will not believe it. It is not clear cut in OT Scriptures that God commanded any such thing!
Regards
Are you aware that the sons of Zebeedee, the first apostles, were not "simple fishermen",but because of where they lived, likely members of the tribe of Zebulon?
In Jewish history, Zebulon supported Issachar, the tribe of scholars. In fact, when they went on the march, Zebulon and Issachar marched at the forefront with Judah, the symbolism being of course, that the Word of God took the lead with the tribe of the other Word of God.
The prophet said, (Jer 16:16) "Behold, I will send for many fishers , saith the LORD, and they shall fish them; and after will I send for many hunters, and they shall hunt them from every mountain, and from every hill, and out of the holes of the rocks. "