From my study of eschatology, I know what the Antichrist’s false religion will be like, it’s perverse imitation of the Sacraments, its priestesses and female head (similar to a Pope), its encouragement of grave sins of sex, violence, greed, pride, and much more. And I see elements in secular society and in religious error today which is aimed in that direction. These things get worse and worse until they reach their height during the Antichrist’s reign.
And this is what is meant by the spirit of the antichrist: the errors and sins that build as time passes, preparing the way for his evil reign. As the holiness of the Israelites prepared the way for the true Messiah, Jesus Christ, so conversely does the evil in society and in religion prepare the way for the false Messiah, the Antichrist.
This rebellion against Pope Francis is the spirit of the Antichrist. It is not Francis who is preparing the way for his future evil reign (in the 25th century), but rather his opponents. The Roman Pontiff represents Christ, and speaks with His authority. So those who rebel against the Pope are rebelling against Christ. They are part of this spirit of the Antichrist. And yet, in their arrogance, they think themselves to be the saviors of the Church and the world.
Like the Antichrist: They reject Church authority. They scribe to themselves a role above all temporal societies and all religions. They promote grave sexual sins (e.g. sins within marriage), while pretending to be holy. They wish to guide others to be like themselves, rather than to be like Jesus. They think they can decide all questions on faith and morals. They attack anyone who disagrees. They judge and condemn Christ, by judging and condemning His Vicars. They wish to form a religion patterned after their own desires. And they think themselves to be holier than (the Vicar of) Christ. All these things are the spirit of the Antichrist.
In the best case, the papal accusers will suffer in Purgatory until the end of time. Some are probably not in the state of grace and are in grave danger of eternal punishment. They accuse the Pope of not believing in Hell, yet they are well on the way there themselves.
Ronald L Conte Jr