No one is forced to be a Christian. But no one should be forced to live according to the "new religion" as though it alone were definitive and obligatory for all mankind.
Certainly, it is difficult to make the demands of the Gospel understandable to secularized people. But this pastoral difficulty must not lead to compromises with the truth.
To live without faith, without a patrimony to defend, without a steady struggle for truth – that is not living, but existing.
“What is perfection in love? Love your enemies in such a way that you would desire to make them your brothers … For so did He love, Who hanging on the Cross, said ‘Father, forgive them, for they know not what they do.’” (Luke 23:34)
Assuredly, the word of truth can be painful and uncomfortable. But it is the way to holiness, to peace, and to inner freedom. A pastoral approach which truly wants to help the people concerned must always be grounded in the truth. In the end, only the truth can be pastoral.
There are many problems with sedevacantism, but the major one is assuming that a Pope has to be faultless. The Pope is a sinner, just like the rest of us, and part of the problem with sedevacantism is that it rests on the assumption that a Pope who has faults cannot be a legitimate Pope, which is of course, non-sense and goes against much of what the Church teaches with regards to sin and concupiscence.
Distinctions Matter
Distinctions Matter Forward
Missale Romanum
Pre-1951 Calendar