[quote="Captain_America, post:1, topic:264419"]
So is "consubstantiation" the same as "transubstantiation"? I've run into someone who believes the Church just became Lutheran!
I get the impression that what drove this person to make that claim is the new translation of the Litugy. "Consubstantial with the Father" is mentioned in the revised Creed.
If that is the case, the Creed is referencing the Nature of Christ relative to the Holy Trinity, which is a seperate issue from the the relation of Christ in the Eucharist relative to the substance of bread or wine.
In the Trinity, Christ is Consubstantial with the Father (and the Spirit), all three share the same Divine Nature or Substance. Thus each person of the Trinity is Consubstantial with the others.
In the Eucharist, the substances of bread and wine are replaced with the Body, Blood, Soul and Divinity of Christ. The bread and wine cease to be, and Christ is substantially present instead. That is Transubstantiation.
As referenced above, there is, any claim that the Eucharist is consubstantial with the substances of bread and wine would be incorrect and heretical.