Scandals and evils have been happening since the times of the Apostles, with many previous ones - including the ones before Great Schism - equally bad or worse than the current one. Arian crisis, all the heresies and schisms rampant in early Church, the whole 11th century crisis (which was perhaps the single worst scandal the Church has ever had, worse than the current one), Western Schism, rise of Protestantism, so on, so on. Of course Satan will attack the Church Christ founded, and at times God may allow his attacks to be very severe, indeed, looking at history severe enough that it's pretty much impossible to imagine any other institution surviving what the Catholic Church has survived. Christ never promised that His Church will remain unattacked. He promised to save it from Satan prevailing over it.
He can be very close to victory, he can have almost all clergy corrupted, he can almost destroy the Church, as he did so many times in the last 2000 years, but in the end Satan will never succeed - God will always in the end top him, as he so far always did, no matter how deep a crisis the Church was going through.
Every single time Christ fulfilled His promise. Do you think this particular time it's going to be different? When Christ promised us to save His Church from Satan ultimately prevailing, do you think He wanted us to escape (and abandon it for some other church which looks, for a time being, healthier) every time Satan starts attacking - behaving like people who don't trust Jesus's promise and, lacking faith in God's providence, think that, even though Jesus promised otherwise, this particular time Satan will succeed?
God never breaks His promise. And if it looks like this time He is going to fail and not fulfill His promise, this is only because of lack of trust in His all-encompassing Providence in the one viewing.
So does Catholicism. Even though Catholics, even high-ranking ones, can turn out to believe Modernist (note here: modifying small-t traditions, e.g. the form of the liturgy, isn't modernism - this has been always happening, both in the West and the East; neither the elaborate Divine Liturgy nor Tridentine Mass was how liturgy was celebrated by the Apostles - "traditional" forms of liturgy are all highly developed and in their modern forms they appeared comparatively late) doctrines - there always were heretics in the Church.
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