Mistranslations in the bible

If bible scholars and theologens understand that a lot of things were misinterpreted in the initial translation of the bible why don't they fix the incorrect text?  Doesn't it make sense to use what the writers of the bible intended?  What if these mistranslations are resulting in people not going to heaven?  Why do ministers preach things that they know are wrong.  One of the biggies is the idea of Mary being a virgin...  It was a mistranslation.  There was no virgin birth...  Jesus was fertilized just like you and me.