Yes, I just made it up. Everyone is a believer.
Origen writes: "Paul, a genuine disciple of Jesus, says that he regarded this James as a brother of the Lord, not so much on account of their relationship by blood, or of their being brought up together, as because of his virtue and doctrine." (Contra Celsum 1.47)
Except Origen.
Yes you made it up.
You're citing Origen to support your "division of scholarship?" You can't be serious. Origen is not a scholar. Also, Origen is writing over a century after James. Finally, he never says that James isn't Jesus' actual brother. Actually, he specifically states he was, shortly before your quote:
Iakobou tou kidaiou, hos en adelphos Iesou tou legomenou Christou/ James the Just, who was the brother of Jesus being called Christ. Now, it could be argued that Origen is just quoting Josephus, except Josephus does not refer to James as "James the Just." Furthermore, your quotation does not indicate that James was not a literal brother of the Jesus, or that Origen believed that Paul thought he wasn't, but rather that he was a more than just a blood brother because he believed.
Your quote indicates that Origen believed Paul thought that James was not a brother just because they were related by blood and had been brought up together, but more because of James beliefs.
It does not say they were not brothers, and were not brought up together.
And, even if,
for the sake of argument, we read more than what the text says, and assumed that Origen believed James was not an actual brother, so what? That Jesus had no actualy brothers is a central part of catholic theology, because they believe in the perpetual virginity of Mary. Even if Origen was,
for the sake of argument, saying that, in that case he clearly reports that Josephus believed James was Jesus' brother (and Josephus was alive while James was). Additionally, Origen is writing a century later. Why should we take his word over Paul, who specifically calls James Jesus' brother?
And you once more you have failed to point to this "division in scholarship" you refer to. Try again.