“There are many historical facts not supported by scripture”
As you say ‘MOST’ are not but neither do we elevate Josephus or Pliny to the authority of Inspired Scripture or if there is disagreement between the secular historians and Scripture raise these writers to a position of superiority, do we?
count-your-change: As you say ‘MOST’ are not but neither do we elevate Josephus or Pliny to the authority of Inspired Scripture
Right. The fact that Mary remained virgin is a historical fact. It is not a fact known from scripture. It is simply a fact; how do you "elevate" it?
if there is disagreement between the secular historians and Scripture [we don't] raise these writers to a position of superiority, do we?
The scripture reflects historical facts also. If there seems to be a disagreement we have to find an explanation one way or another. In this case, there is no contradiction between the virginity of Mary and the scripture, so the issue does not arise. The contradiction is only between the way some modern readers, who often read as if the scripture were written by modern English speakers, interpret the scripture, but not with the scripture itself.