"Jesus' mother somehow stops being his mother? When did your mother stop being your mother?"
So, this is where the basic error of the myth of 'Mary' Mother of God comes from. I mean, we all know instinctively that it is really just a 'mommy' thing, but we have to wait and hear how they describe it.
They are the same carnally minded 'believers' who's reasonings are with the Jews of Jesus' day. Even as the Jews had no real concept of God's Spiritual kingdom on earth and in heaven, so these do not either.
I have been very perplexed by the persistence in adoring a so-called perpetual motherhood and virginity of Mary, and now it is clear to me. We, who are of mature faith in spiritual understanding of eternal place in heaven with God according to the Scriptures, are dealing with spiritual babes, who are so carnally minded, that they actually think that a mother on earth, or father, sister, brother, cousin... will continue to be so eternally.
That is just plain silly on such a child's level of thinking. I understand it, because I once a child that liked to think it, but when I became an adult in Christ, I understood it not to be so (1 Cor 13). I do not look to see my 'mother' or sister or brother or cousin in heaven, but rather simply another saint in glory...
Jesus' mother, my mother, anyone's mother, sister, or brother will cease to be so, when we die. After death we cease to know each other after the flesh (2 Cor 5). The only relationship that will matter will be that with God: whether with the Lord Jesus in heaven or with that of satan in hell. We will be as the angels in heaven with no special personal relationships held over from earth (Matthew 22).
We will all be mothers, sisters, brothers..."And every one that hath forsaken houses, or brethren, or sisters, or father, or mother, or wife, or children, or lands, for my name's sake, shall receive an hundredfold, and shall inherit everlasting life." (Matthew 19)
Before Jesus died, He was already prophesying this by transferring Mary's relationship of 'motherhood' from Himself at the marriage of Cana, calling her woman, not mother (John 2). The only ones to refer to her as His mother were other Jews (Mark 3), and at the cross, He finally gave that relationship to John.(John 19)
"Who is my mother, sister or brother? They which do the will of God "(Matthew 12). There is no more clearer statement by the Lord Jesus that no one is nor will be especially His 'mother'. This is simple first principle doctrine that Jesus taught to the scoffing Jews, who asked the same question as above, trying to trip him up:
"In the resurrection therefore, when they shall rise, whose wife shall she be...?" (Mark 12)
The same question applies to that of Mary: "In the resurrection therefore, when they shall rise, whose mother shall she be...?"
"Ye do err, not knowing the scriptures, nor the power of God." (Matthew 22) No one's. No marriages, no mothers, no sisters, no brothers...
Mary worshippers are simply childishly carnal (to put it lightly) in the faith of God and in understanding of Scripture, because they are still babes in the arms of their mystical mother 'Mary'. They will never be eating the strong meat of the Lord Jesus, because they will never move on from the mystical milk of 'Mary'. Some of them may think they are adults in 'knowledge', because they have learned a whole lot of Mary teaching, even to the point of 'going to the Greek', but all that knowledge is the pride of man, not the sound doctrine of Scripture.
That is why they continue to look to signs in the clouds or stars or trees or statues, in order to try and confirm what they believe is real and true. They know in the heart, it's not really so, but persist in trying to confirm it anyway. Why? Because they want to. Because it is usually nicer and less demanding to go to their mommy rather than to face openly the Father. (2 Cor 3)
The source of all Mary worship is just the little child's desire to see mommy and daddy in heaven. It really is that simple. And as a child, we can understand it, but as adults in Christ, we know it is foolish sentiment, not sound doctrine. And all the books and catechisms and divings into Greek will never change that obvious fact.