Down yonder, a commenter (in dialogue with another commenter) writes:
The Church has traditionally distinguished between material apostasy and formal apostasy.
Jews who were never Christians are mateiral apostates. Jews who once were Christian are formal apostates.
"Based on that definition, any non-Christian of the Christian era could be considered a material apostate."
This is correct.
"Jews who sincerely believe that God requires them to follow the covenant established with Abraham and the Law given to Moses, and are therefore doing so to the best of their ability, can in no way be termed ‘apostates,’ materially or formally."
You obviously do not know the meaning of the phrase "material apostate" or "material sin" in general.
I’m sorry, but no.
The term "apostasy" is defined as follows:
[A]postasy is the total repudiation of the Christian faith (Latin, apostasia, fidei christianae ex toto repudiatio) [CIC, Can. 751].
Regarding the material/formal distinction in moral theology, those who commit a sin "materially" are those who perform it through no fault of their own (i.e., without culpability), while those who commit it "formally" are those who perform it through their own fault (i.e., with culpability).
In regard to the sin of apostasy, a material apostate would be one who totally repudiates the Christian faith without being culpable for doing so (due to a defect of knowledge or intent), while a formal apostate would be one who totally repudiates the Christian faith with adequate knowledge and intent.
The problem with maintaining this in the case of Jews or other non-Christians in the present age is the meaning of the word repudiatio.
As you might suppose, repudiatio means "repudiation"–the rejection of something one has previously held.
One thus cannot be an apostate from Christianity unless one has previously been a Christian and then totally repudiated the Christian faith. Jews who have never been Christian and other never-been-Christians of the present age (or any age) are thus not apostates.
The correct term for never-been-Christian Jews and never-been-Christian others is "the incredulous" (i.e., those who do not believe), per the Catechism of the Catholic Church:
Incredulity [Latin, incredulitas] is the neglect of revealed truth or the willful refusal to assent to it [CCC 2089].
Those never-been-Christians who are disbelieve through no fault of their own are the materially incredulous. Those never-been-Christians who disbelieve through their own fault are the formally incredulous.
