In the Bible, it is obvious that Virgin Mary was always Virgin, and she only had one child: Jesus Christ, our Savior.
On this I would have to strongly disagree. The Bible names many of Jesus' siblings, and references His sisters. The citations have already been given. As to John being given the care of Mary, John was the one Jesus loved. In addition, he was the only one physically THERE. Jesus' siblings fled with the rest of them. The choice belonged to Jesus, and Jesus Himself was not subject to following any custom.
Saints, Popes, Ecumenical Councils, even the Progenitors of the Protestant Reformation are all wrong.
It's a shame, but they were all wrong. Scripture contradicts the idea of Mary's perpetual virginity. Now, if for some reason it was important to you all that Mary was left-handed, then I would be much less inclined to argue about it. :)
If everyone else who has ever lived is wrong and only you are right, what might that reveal about your ideas?
In referring to "everyone else who has ever lived", you must mean "... except for the hundreds of millions of Christians who never believed that Mary was a perpetual virgin". It reveals to me that I agree with those hundreds of millions, and much more importantly, the Bible.
Jesus didn't think much of His family then. He ignored His siblings and sent Ol' Mom off to live with John. I wonner what Ol' Mom though of that or what her other children thought about the slap in the face.