We believe in one holy Catholic and apostolic Church.
We recognize that after the middle of the Twentieth Century, the doctrine and liturgy of this indefectible Church have been encroached upon by Modernist doctrine and liturgy. This infernal work has been carried out by the very men who are responsible for preserving Catholic doctrine and liturgy.
The Thesis of Cassiciacum (machine translation, discussion) suggests how Catholics may reconcile the apparent contradictions within the current situation.
Pray to Our Lady for the purification of the Church in the Triumph of her Immaculate Heart.