It has been remarked many times that apart from the address and a couple brief interpolations the book is Jewish and not Christian. It doesn't refer to any uniquely Christian doctrine of practice. Healing was claimed done in Jewish rite in the manner described in James 5, they poured oil on the sick one and prayed. In Intertestamental texts Moses was said to have expelled demons by laying on of hands. GenApoc. 20:16-20
For the Wt to face the reality that the Epist. James was not accepted into wide Christain use for hunders of years and that all evidence points to it being a Jewish work edited by Catholic redactors would be too much to ask.