Protestants.
What does Jesus call phony priests who claim they are the Christ???
"The church teaches that he [the priest] does this in what is called insomnia nomini Christa, that he does this in the name and the person of Jesus,"
Luk 21:8 And he said, Take heed that ye be not deceived: for many shall come in my name, saying, I am Christ; and the time draweth near: go ye not therefore after them.
Jesus knew about your crowd way ahead of your arrival...
Mar 13:6 For many shall come in my name, saying, I am Christ; and shall deceive many.
No one comes in Jesus Christ's name and person but, Jesus Christ...
God says you have been deceived... .
To act "in nomine Christi" is to act with authority given by Him, as in the phrases, "Stop in the name of the law" or "I enjoin you in the name of the Queen" or "in the name of this Court of Chancery."
A priest who offers Mass as Christ's eternal action, "in persona Christi," is no more "deceived" than St. Paul who says,
Galatians 2:20
I have been crucified with Christ and I no longer live, but Christ lives in me. The life I live in the body, I live by faith in the Son of God, who loved me and gave himself for me.
and no more "deceived" than Christ Himself, who said,
Luke 10:16(KJV) He that heareth you heareth Me;
and he that despiseth you despiseth Me;
and he that despiseth Me despiseth Him that sent Me.
You can still say you don't believe the proposal that the priest "is" Christ, in the sense of "ipsissima res," but that's OK, because that's not what the Catholic Church proposes.