The answer
The Bible does not just consist of one verse but is a whole book full of them.
Anyone who uses one verse to the exclusion of. the others which relate to it, is not giving a true picture of what the Bible is saying, nor is he giving the full meaning of Divine Inspiration.
The word "wall" in the Bible is used to mean protection.
Thus one of Nabal the Carmelite's servants said to Abigail: " They were a wall to us both by night and day, all the time we were with them keeping the sheep. " (1 Sam. 25:16), meaning that they had protected and defended them.
It was in this sense that "the walls of Jerusalem" were looked to for protection from one's enemies, and the phrase 'a city without walls' came to mean one that was open to its enemies, without any protection or defence.
But let us see whether God is the only one who has been specially referred to as being a 'wall', or whether this word has also been applied to human beings.
This title has in fact been used for certain people, perhaps the best example we have is that of Jeremiah, of whom the word of God said: " And I will make you to this people a fortified bronze wall, .... " (Jer. 15:20)
If God Himself appointed this prophet to be a protector for the people, to the extent that He called him a "wall" for them, and a strong wall at that, then it is not contrary to faith for the Virgin to be regarded as a wall, because she was in every way more important than Jeremiah.
The Lord confirmed this purpose of His to Jeremiah himself when He said to Him: " I have made you this day A fortified city and an iron pillar, And bronze walls against the whole land; Against the kings of Judah, Against its princes, Against its priests, And against the people of the land. " (Jer. 1:18)
What an amazing thing it was, that Jeremiah be a wall to all the land! The bride in the Song of Songs is also referred to as a 'wall':
" I am a wall, And my breasts like towers; then I became in his eyes as one who found peace." (Song 8:10) If we consider the bride here to stand for the Church, then the Church can be regarded as a wall for believers, to protect them from falling.
We have obtained salvation through the blood of Christ, and what we have obtained and now have, requires prayers to protect it and to be a wall surrounding it, so that we do not fall, through lack of faith.
No prayers are more powerful than those of the Virgin Mary, the Mother of God, the 'wall of our salvation'.
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Thrice-Blessed Pope Shenouda III of Blessed Memory