Pope Honorius I (625-38) was posthumously condemned as a heretic and excommunicated from the Church by the ecumenical Council of III Constantinople (680-1). He promoted the heresy of the Monothelites, who taught that there is only one will in Christ; the orthodox doctrine is that Christ has separate wills in his human and divine natures.
Yet, Honorius I was called "vicar of Christ" by the Roman Catholic church, when in fact he was an antichrist, which can be said for a large number of popes of Rome.
No he was not an antichrist. The Church is clear.
You are not supplying many examples of clear understanding of the Church, I’m afraid.