If Max quotes you correctly in the highlighted passage above, then you specifically did say that in Galatians 1:19 the writer tells any readers that Jesus had a brother called James. That is exactly what those quoted words say. Are you quoted correctly saying that?
But instead of denying that you ever said what is given in Max‘s quote (where everyone here can easily see what it says), you should be very interested in what dejudge is saying about this, because if he is correct then it casts into very serious doubt that particular line in Galatians where it says “other apostles saw I none, save James the “the lords brother”.
Because if I understand him correctly, what dejudge is saying is that if you look at the actual words in P46, it does not in fact say “lord”. Instead it says (according to dejudge) “KY”, which dejudge says is a so-called “Nomina Sacra” meaning “the Lord God”.
In which case that line on Galatians is apparently referring to “James” as a brother of “the Lord God”.
We haven't discussed this absurdity yet. Perhaps now's as good a time as any. I have asked for evidence that Paul thought that Jesus is God.
dejudge says that the image of P 46 contains that expression. Only when we enquire further, are we informed that it is a question of a nomen sacrum. In a second or third century Christian work. And it means "Lord God", we are asked to believe unquestioningly, because of course God is called Lord by Christians; and third century Christians believed Christ to be God. But that proves nothing about Paul, only the opinions of his copyists centuries later. Apart from dejudge, does anyone here believe that Paul is entirely a second or third century forgery?
Anyway, does the nomen sacrum in question (KY) mean "Lord God", or simply "Lord", often applicable to God? Or is there another NS specifically meaning "God"? Well, why the hell don't we look? Let's do that. It's in
https://en.m.wikipedia.org/wiki/Nomina_sacra#List_of_Greek_nomina_sacra.English
Meaning Greek Word Nominative (Subject) Genitive (Possessive)
God Θεός ΘΣ ΘΥ
Lord Κύριος ΚΣ ΚΥ
Now, I'm spending no more time on this nonsense. KY is NS for Lord. The Galatians expression means "brother of the Lord".