All depends on which Book is believed. It is not as if there is NO 'history' prophets, foretelling of the virgin birth of 'God with us'. The prophets already wrote down what was to come.
Isaiah 7:14 does not mention a virgin birth. The seventh Book of Isaiah has to do with King Ahaz of the Kingdom Judea. In 732 B.C.E. the House of David was facing imminent destruction by two fighting kingdoms: The Kingdom of Israel and the Kingdom of Syria. King Ahaz and the House of Israel were terrified and G-d sent Isaiah to reassure the king that he would be protected and the two armies would not succeed in destroying Jerusalem. The alleged virgin birth would not occur for another 700 years.
Read Isaiah 7:11 and 16 to get the correct context.