You are free to believe whatever you wish...I have presented my argument and have no interest on proving anything to someone who doesn't want to know....but you can never say that no one told you.You spoke generally, and not in "some detail," but to great lengths. Again, in other words, what did Papias of Hierapolis, Hegesippus, Clement of Alexandria, Eusebius of Caesarea, and Jerome of Stridon each specifically do that deviated from the teachings of Jesus and His apostles, and thus makes them unreliable sources for this thread topic?
The OP and post #2 show the authors of the James and Jude epistles were Jesus's apostles, James and Jude (Thaddeus) of Alphaeus, who were also two of His brothers, in Mt. 13:55/Mk. 6:3, as in "kinsman," specifically, cousins. Your counter-argument is that since the authors of these epistles identified themselves in one instance as a "servant [slave] of Jesus Christ" (Jm. 1:1) and a "servant [slave] of Jesus Christ" (Jd. 1:1), rather than an "apostle," they were not apostles, which is weak at best. Especially when it is written that those called in the Lord are the "bondman [slave] of Christ" (1 Co. 7:22) and Paul, for example, was called to the apostleship, and called both an "apostle" and a "servant [slave] of Christ" in a couple of instances (Rm. 1:1, Ti. 1:1), as well as solely called a "prisoner [slave] of Christ Jesus" in another (Pm. 1:1). Am I to expect anything further from you on this point, or was that all?
Before I can face Jesus had half-brothers, you need to consider the word "brother" (ἀδελφός [adelphos]) has a range of meanings, e.g., "fellow believer," "kinsman," e.g., "sibling," "uncle," "nephew," "cousin," etc., and show the meaning "sibling" applies to its singular and/or plural form in the verses you believe to refer to His siblings.
I don't worship/venerate Mary and have no interest in believing what the Catholic church says about Jesus' half siblings or anything else quite frankly. You can juggle the scriptures all you like....Mary was not "ever virgin". There is no reason to believe she had to be outside of Catholicism's elevation of her as some kind of goddess. She is barely mentioned by Jesus or the apostles.
Have a happy life....