The SSPX is the traditional Catholic priestly society that against Vatican II and the reformed after Vatican II.
SSPX has strong love for Traditional Latin Rite. They consider Orthodox Christians as schismatics.
They against ecumenism and sincerely believe that outside the Catholic Church there is no salvation.
They know that after Vatican II the Roman Catholic Church is in seriously errors.
However, there are some converts in Orthodox Church used to be the SSPX supporters.
How do they realize that the Roman Catholic Church is not the true church, and the Orthodox Church is the true church?
How do the converts from SSPX background overcome the fear of eternal damnation ? And the Catholic doctrines that they believe so sincerely like papal infallibility and supremacy are false?