Did you read the premise? It's a traditional belief, and matches the Scriptural belief, as well.
Clearly the Early Church was following the teachings of Jesus, and this is reflected in the Scripture.
Jesus sent Paul to gather in the required number of uncircumcised Gentiles, and no demand was put on those gentiles to be circumcised.
Although Peter and James the brother of Jesus had a dispute with Paul over this issue, and it was eventually agreed the Gentiles need not be circumcised.
But the Jewish church of Jesus, continued the practice,
From “JESUS THE EVIDENCE” by Ian Wilson; “And of James the son of Alpheaus, who was the first to sit on the Episcopal throne of the church of the circumcision in Jerusalem, we learn from Josephus, Eusebius, and Hegesippus, that he was murdered in 62 AD, at the instigation of one of the same Sadducee sect that had his brother Jesus murdered, and that James the righteous was succeeded by Simeon --- of Cleophas/Alpheaus.
Simeon a half-brother to Jesus, was succeeded by 13 other Bishops of the circumcision, among who, several others, like Simeon and James, appear to have been blood relatives of Jesus. In 132 AD, with the second Jewish revolt, the line was extinguished. Epiphanius of Salamis, in his Panarion, mentions Judah Kyriakos, the great grandson of Jude, as the last Jewish Bishop of Jerusalem that lived beyond Bar Kokhba’s revolt.
It was not uncommon for men of Galilee in those days to carry three names, one in Hebrew, one in Greek, and one in Aramaic.
Thomas=Tau’ma, the Aramiac for twin, is also called Didymus, which is the Greek for twin, he is Thomas/twin, Didymus/twin, Jude, the half-brother of Jesus and the son of the carpenter. A local tradition of eastern Syria identifies the Apostle Jude with Jude Thomas who was called ‘The Twin’ also known as Thomas (Aramaic), Didymus (Greek), and Jude (Hebrew.)
Knowing that in ART, Thomas Didymus Jude, the son of Alpheaus/Cleophas, is depicted with a, carpenter’s rule and square. In "The Acts of Thomas, sometimes called by its full name, "The Acts of Judas Thomas," 2nd-3rd century CE, "The Apostles cast lots as to where they should go, and to Thomas, brother to Jesus fell India. Thomas was taken to King Goddophares the ruler of Indo-Pathian Kingdom as an architect and carpenter by Habban.”
But that belongs to another thread.