You are deliberately deceiving people. I have stated that Mark says Jesus had brothers, including a James. Elsewhere, in Paul, we have a James who is a "brother" of "the Lord". But I agree, in listing Jesus' brothers, no source states that the sibling James, brother of Jesus, is the same person as Paul's "Lord's brother". I have never claimed that it did. Nevertheless I think it reasonable to identify these two characters as the same person. That seems probable to me.
On the surface it does seem to be a logical thing to do...but Paul uses "brother" and "sister" to reference followers of Jesus and Mark 3:35 has Jesus state "For whosoever shall do the will of God,
the same is my brother, and my sister, and mother."
So the logic is flawed in that Paul doesn't state if the James he references as brother of the Lord is an actual sibling and in Mark Jesus himself calls
all those that "do the will of God" "my brother, and my sister, and mother" and
no where in Mark is there any connection between the sibling James and either of the two James that are listed as being part of the twelve.
The logical thing to clear up any possible confusion would have be to say James brother to the Lord
in the flesh but Paul doesn't do that and Mark doesn't show that either of the James he lists as part of the twelve are in anyway blood related to Jesus.
What you have with this argument is what amounts to confirmation bias where one is letting their
assumption drive the data. It is what Horace Miner did in his 1956 article where every practice of then current 1950s United States actually firmly based on science is skewed through the "primitives use magic" lens so common back then.
Chlorination of water to prevent disease is reduced to "the Water Temple of the community, where the priests conduct elaborate ceremonies to make the liquid ritually pure."
The hospital with all it hard learned scientific advances is reduced to a temple "that is where you go to die" with the nurses now "vestal maidens" and the doctors now "medicine men".
Scientific Medicine is reduced to "ceremonies" of "discomfort and torture" with "magic wands" (thermometers) and "magically treated needles" (antibiotics and medicines).
After this Horace Miner's fellow anthropologist got the hint and actually looked at magic they discovered the only real differences was that magic didn't have a self correcting mechanic nor a set procedure for determining which concept best fit what was being observed.
The whole James brother of the Lord connection has the same problem. It is working from the
assumption that "brother" in Paul is being used in the biological sense and trying to make everything fit that
assumption. Once you leave the option open that "brother" could be used in a
spiritual sense the whole house of cards falls apart and there is NOTHING to show that any apostle called James was an actual biological 'brother' to Jesus.
Also assuming this is actually Paul you have this James being
separate from the twelve:
And that he was buried, and that he rose again the third day according to the scriptures:
And that he was seen of Cephas,
then of the twelve:
After that, he was seen of above five hundred brethren at once; of whom the greater part remain unto this present, but some are fallen asleep.
After that,
he was seen of James; then of all the apostles.
And last of all he was seen of me also, as of one born out of due time. - 1 Corinthians 15:4-8
Here Paul clearly shows that James is an apostles but that he is NOT "of the twelve" because "the twelve" saw the risen Jesus BEFORE the "five hundred brethren" while James saw the risen Jesus AFTER. If this passage is totally faithful to what Paul actually wrote then this James CANNOT be any of the two James who are listed as being "of the twelve"!
I should point out unless there is something wonky about the way Greek translates Cephas is NOT "of the twelve" either; otherwise the passage would read 'then
by the rest of the twelve'!