Could it be that some form of original Judaism is still the truth?  Yes.  Let’s call it…um…Chrisitianity.  (I apologize for the sarcasm)  Didn’t many of the early followers of Jesus celebrate the Sabbath and the 1st/8th day on Sunday?  It seems to me we gather on Sunday to remember the life, death, resurrection of Jesus, celebrate the Lord’s Supper and the new life to which we have risen having shared in Jesus’ death and for which we are being nourished. 

On to the real issue.  I think it is always important to remember that our faith is not in written Scripture but in Jesus Christ to whom Scripture witnesses.  Most Biblical scholars will point out that the VB is a later development in the canon with no mention of it in Paul.  Paul did not preach "Christ and him virgin birthed," but "Christ and him crucified."  From the cross (and Jesus’ message) we are asked to take all sorts of leaps of faith, many of which are blind.  Isn’t that the nature of faith?  (Though I don’t think that prohibits us from using our "all our mind" before taking that leap.)

While it may not be the way the world works, it does seem to be the way God works.  By that I mean, Jesus seems to be another in a long line of God’s chosen who have been born through God’s intervention.  For example, the Genesis patriarchs and Samuel.  I think the virgin birth stories were meant to join Jesus with Jewish tradition (and fulfill it through the Holy Spirit) rather than equate him with outside, Hellenistic divinities. 

There is no doubt that Isaiah 7:14 presents problems in interpretation.  But my devotion to God through Jesus Christ (my Christian faith) does not hinge on the virgin birth.  There is evidence for the incarnation without any mention of how it took place (Phil. 2:1-11).  

I’ve lost anything that might resemble a train of thought so I’ll stop and respond more later.  A new baby and lack of sleep make my mind foggy.