James was one of the circumcision apostles that were originally healing EVERYONE.
Acts 5:12-16 (AKJV/PCE)
(5:12) ¶ And by the hands of the apostles were many signs and wonders wrought among the people; (and they were all with one accord in Solomon's porch. (5:13) And of the rest durst no man join himself to them: but the people magnified them. (5:14) And believers were the more added to the Lord, multitudes both of men and women.) (5:15) Insomuch that they brought forth the sick into the streets, and laid [them] on beds and couches, that at the least the shadow of Peter passing by might overshadow some of them. (5:16) There came also a multitude [out] of the cities round about unto Jerusalem, bringing sick folks, and them which were vexed with unclean spirits: and they were healed every one.
So to attempt to hitch your wagon to James is a mistake. James makes it crystal clear that his audience is the twelve tribes of Israel (James 1:1) and there is a reason for that and it cannot be ignored without misunderstanding the doctrine contained therein.
Even the first book to the Corinthians was very early. There were changes that God was making and that is why it was already pointed out to you that late in Paul's ministry he was no longer healing people but was leaving friends sick (and recommending wine for stomach problems).
God does NOT always do the same things all of the time and you need to follow His progressive revelation if you really want to understand what was going on at any point in time (including today).