Looking at the heresy of Core, we find the following in the New Testament which warns:
Jude 1:11 Woe unto them, for they have gone in the way of Cain: and after the error of Balaam they have for reward poured out themselves, and have perished in the contradiction of Core.
Abortion by contraception most certainly qualifies as the way of Cain, and the error of Balaam is pharmacia, sexual infidelity, sexual immorality, sacrifices to idols, and unnatural sexual behavior. The vast majority of US Protestants (probably in other countries as well) either ignore or accept as harmless all but a few drugs drugs, remarriage after divorce, and contraception, they also at least tacitly accept homosexuality, the health wealth and prosperity gospel to some degree if not completely. Whether the majority of folks want to look at reality or not, that means the vast majority of Protestants in this country cover all the bases of Balaam with some taking exception to one or two but never all of the Balaam idolitry. As for the contradiction of Core, of course, it's exactly what Luther and all Protestants preach, described here:
Numbers 16:1 And behold Core the son of Isaar, the son of Caath, the son of Levi, and Dathan and Abiron the sons of Eliab, and Hon the son of Pheleth of the children of Ruben,
Numbers 16:2 Rose up against Moses, and with them two hundred and fifty others of the children of Israel, leading men of the synagogue, and who in the time of assembly were called by name.
Numbers 16:3 And when they had stood up against Moses and Aaron, they said: Let it be enough for you, that all the multitude consisteth of holy ones, and the Lord is among them: Why lift you up yourselves above the people of the Lord?
It's crystal clear, then, that the heresy is for Core to claim that all are holy and since all are holy all are the same as priests, leading naturally to the heresy itself which is that there should be no priesthood over the people but each person is sufficient unto themselves. Along with ignoring the command to obey your prelates, all Protestants ignore the heresy of Core by virtue of the fact that it is intrinsic to all Protestantism.
Along with a description of the heresy, naturally we're told what the proper response to those who follow and teach such a heresy should be, here:
Numbers 16:26 He said to the multitude: Depart from the tents of these wicked men, and touch nothing of theirs, lest you be involved in their sins.
We're also told the proper response to those who have been told the truth multiple times and refuse to accept it:
Matthew 7:6 Give not that which is holy to dogs; neither cast ye your pearls before swine, lest perhaps they trample them under their feet, and turning upon you, they tear you.
and here:
Galatians 1:9 If any one preach to you a gospel besides that which you have received, let him be anathema.
Redefining words and reinterpreting clear written sentences to mean something the original author never intended qualifies as preaching another gospel, by the way. For example, if anyone were to look at a verse originally written in a language with a single word for any and all forms of "rock", then redefine one instance of the word "rock" in that sentence to derive a meaning that better suits them, they would without any doubt be preaching another gospel. Likewise with ignoring the clear teaching of Scripture with regard to the heresy of Core, the sin of contraception, and a great many other things intrinsic to Protestantism.
Therefore, once they've been told and it's obvious that they've hardened their heart against the Holy Spirit, anathema.
Have a nice day
I quickly read through that entire diatribe and did not see even one sentence defending your position or acknowledging the scriptures I provided. It was all just a bundle of assertions with no real usefulness.