text: <Transubstantiation is the theological explanation ...>
  No, it isn't.  "Transubstantiation" is not a theological term; it is borrowed from philosophy. It is employed as A, not THE, explanation of the Real Presence -- and not necessarily or always a helpful one.  The church managed to celebrate the Eucharist for more than a thousand years without the word "transubstantiation" to explain it.
  Pew reports that 68% of Catholics (well over 50% ) support civil same sex marriage. I hope and expect that percentage will grow.  Catholics, like most people, tend to support abortion in some circumstances. Euthanasia means different things to different people in  different circumstances; thus polling on it is difficult.  For that matter, it is tricky to poll "Catholics".  Some polls define Catholics by Mass attendance, etc.; others allow the respondents to define themselves.  
  Still waiting for an explanation of what, if anything, you meant by the cliche you used in your earlier post.