Priestly Celbicay has not always been a practice of the Church, and could CHANGE if need be, although I think that would be a bad idea in this day and age. Of course Peter had a wife, that does not exclude him from being Pope. If that is your only reason, then it is a bad one.
The word "until" does not necessarily mean that afterward they would have. Other passages which use the word "until" but clearly do not mean that it changes afterward:
1 Timothy 4: 13, 6: 14
Romans 8: 22
Philemon 1: 5
Genesis 8: 5, 49: 10
As you can see, the "until" argument is groundless.
Also, "adelphos" does not mean "disciples", it means "kin". Jesus had kin, He just had no brothers or sisters.
It is funny that you mention Matthew: 55-56 as the cornerstone of your argument becuase it is the cornerstone of MY argument. Two of these "brothers" are in other places named as sons of a DIFFERENT Mary, Mary of Cleophas! Matthew: 27: 56, John 19: 25!
So, apparently, not only does your verse NOT prove Jesus had brothers, it is definitely a good verse for ME to use. NOWHERE in the Bible does it say Mary had other sons. Does it say Jesus had other kin, or "adelphos"? Yes, but that proves nothing.
Alright, Salvation. I believe we are saved through God's grace, manifesting itself in our Faith and Works. What about you?
Titans baby, Titans.