Why is it important to non-Catholics that the English word "virgin" be the translation in Isaiah 7:14 and Matthew 1:23?

Matthew 1:23 uses the word [G3933 - parthenos](https://www.blueletterbible.org/lexicon/g3933/kjv/tr/0-1/) . Thayer's Greek Lexicon says it can mean: - a virgin. - a marriageable maiden, or a young (married) woman. He is quoting Isaiah 7:14, which uses the word [H5959 - ʿalmâ](https://www.blueletterbible.org/lexicon/h5959/kjv/wlc/0-1/) . This Hebrew word is defined as: - young woman (ripe sexually; maid or newly married). Almost all English translations render it as "virgin". Whether it's "virgin", "maid", "marriageable maiden", "newly married", or whatever, it really doesn't make much difference, as Matthew clearly provides the detail that *is* significant: - 1:18 "*with child of the Holy Ghost*". - 1:20 "*that which is conceived in her is of the Holy Ghost*". It's obvious why the Catholic Church (Roman or Orthodox) would want "virgin" to be the translation, but why do any other Christian denominations care about it? --- # Note that this is not asking about the Roman/Orthodox position, nor is it asking for what the "correct" translation is. It is asking why *non-Catholic* denominations also seem to believe the "virgin" translation is important and significant. It is similar to, but not a duplicate of [*Why was it necessary for Mary to be a virgin?*](https://christianity.stackexchange.com/questions/2414/why-was-it-necessary-for-mary-to-be-a-virgin) , as that was too broadly scoped, and was doctrinal rather than about translation.