Again the Lord spoke to Ahaz, “Ask a sign of the Lord your God; let it be deep as Sheol or high as heaven.” But Ahaz said, “I will not ask, and I will not put the Lord to the test.” And he said, “Hear then, O house of David! Is it too little for you to weary men, that you weary my God also? Therefore the Lord himself will give you a sign. Behold, the virgin shall conceive and bear a son, and shall call his name Immanuel. He shall eat curds and honey when he knows how to refuse the evil and choose the good.
There has been much revision of this passage in the 19th and 20th centuries and on. Now people claim that Isaiah did not really mean a virgin, but a young lady. That is not the understanding of Luke. That is not the understanding of Paul who referred to Luke’s letter as scripture (See 1 Timothy 5:18 citing Luke 10:7). The understanding of the church fathers and nearly two thousand years of church history is that Mary was a virgin when the Christ was born.
It is the conclusion of the prophesy of Isaiah. It is the beginning of the restoration of Eden, where God walked with us in the garden, now he comes again to walk with us — Immanuel, God with us. He comes via a miraculous sign — a virgin giving birth.
Christianity is a religion of miracles. It is a religion of parted seas, fire from the sky, blood in rivers, the blind seeing, the lame walking, the deaf hearing, and the dead rising again. If you cannot believe the virgin birth, how then can you believe the resurrection? And if you cannot believe in the resurrection, you cannot believe in the real Jesus.
Not I nor any preacher on the planet tells you that you must believe the virgin birth. Your faith tells you. Your faith compels you. Without the virgin birth, the Christ you claim to know is not the Christ who was, is, and always will be. He is something else entirely.
Your faith compels you to believe in God the Father Almighty, maker of heaven and earth, and in His son, Jesus Christ, who was conceived by the Holy Spirit and born of the virgin Mary.
Faith compels our beliefs and if we have not the faith to believe those things, how then can we have any faith in the redemptive power of our Lord?