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Arianism was honestly probably a larger threat. Despite the fact that it didn't have a super ecclesiastical structure and it wasn't a mirror of the catholic church, arianism was the religion of the inheritors of the western Roman empire until they were conquered and converted by belisaurius. The visigoths converted to nicene christianity on their own. If neither of those two things happened, Latin rite catholicism might just be extinct. We would only have the byzantine rite left, and there would not be an orthodox church as we know it, because the Latin church to schism from would largely be defunct and the position of the pontifex maximus as bishop of Rome would be rendered null and void. The ostrogoths did not actively seek to destroy the catholic church, however there's no guarantee that the tolerance would have continued, and there's no guarantee that the population of Italy wouldn't have converted on their own to copy the rich and powerful as people tend to do.

Nowadays though we have judaizers in control of the strongest (well, that's debatable now) country on earth. This has a myriad of consequences that we already see every day. This is the most dangerous heresy.

Furthermore, I consider that Israel must be destroyed

One man's heresy is another man's orthodoxy. I'm inclined to Marcionism because it's the oldest form of Christianity known, before misguided Christians, and especially converted jews, began to interpret the preach the new faith according to their own beliefs and preferences.

Remember, in every conflict there are two sides. The Catholic Encyclopedia only gives the Catholic perspective. The Marcionite version is quite different and sheds a lot of light on why they believe the way they do. In particular, it has everything to do with rejecting jews and refusing to accept infiltration of jewish beliefs into the Christian faith.

To be fair, "This is a brand new god" does make a lot more sense than "God woke up one morning and decided to change his entire nature, so he sacrificed himself to himself so he could do that."