Dear Sonny1954,
As you know the Letter to James has always proved a stumbling-block to Protestants, well at least historically, because it unequivocally teaches that we are justified by our works and not merely by faith alone (per solam fidem). Now it is an historical fact that Martin Luther spoke very disparagingly about the Letter of James because it did not square with his novel doctrinal position of Justification by faith alone. However he was unable to find a rationale for its removal from the Canon of Scripture.
Following a debate with a Lutheran here on CAF, I gather that Luther, along with the early Fathers, placed St. James with Jude, I Peter, II & III John and the Revelation in the antilogemena (books that lacked universal approval of the Church as canonical); whereas the rest of the N.T. belonged to the homolegoumena, that is, books recognised by all segments of the Church as canonical.
Apparently Luther left acceptance of James to the individual Christian (an extreme example of the use of private judgement if ever there was) with the warning that no doctrine can be established from the antilogemena that would either contradict or conflict with the clear words of the authoritative Scriptures (homolegoumena). This was a desperate casuistical attempt on the part of Luther to evade the teaching of James, which ran counter to his own doctrinal opinions.
That notwithstanding, the Letter of James is cited as Sacred Scripture by SS. Ephraem, Hillary, Jerome, Ambrose, Augustine and others. Thus it can be claimed that James found acceptance in the Church from the 4th. to the 16th. cent., when Erasmus, Cajetan, as well as Luther, revived doubts about its authenticity and catholicity. However, for we Catholics, both of these issues were settled at the Fouth Session of the Council of Trent. Hope this and the previous posting has enlightened you a little. Let us know if you have any further questions, either your own or arising from our respones.
Warmest good wishes,
Portrait