A disturbing study by the Pew Research Center finds that most Catholics do not believe in Transubstantiation,a core teaching of the faith that the bread and wine at Eucharist become the Body and Blood of Jesus Christ. Also, most Catholics surveyed do not know what the Church actually teaches on this subject.
The complete Pew Research Center study can be found here.
Bishop Robert Barron responds with on this video to the survey's findings.