Well this is an interesting statement. How can this be? Heaven is subject to the church? I don’t think so.
So if the church decided tomorrow that there is no such thing as purgatory, does God almighty shut down purgatory because the church said so? Because that is what you are saying.


Personally I think Purgatory exists so I don’t see that happening. However to take your hypothetical case, if the Church decided that it had been wrong about the existence of Purgatory, then it could change its mind. Now you might wonder what inference that might have in heaven, which always knew whether purgatory existed or not.
However if prior to the change in doctrine, it had been a required article of faith for Catholics to accept the reality of Purgatory, then that belief would be required for admission to heaven, prior to the change of doctrine, as faithful Catholics. Mind you I think God would soon have disabused the church of such a teaching.
But I think the example you’ve chosen is not a good one. The contraceptive pill is not in that category, since birth control is an earthly reality here on earth, as are food and resource pressures, starvation, famine and all the rest. I’m also convinced God intends to drive us off the planet and in the early days of pioneering space settlement, there simply won’t be the resources for large families.
I think the pill was God’s gift, given at the very time population pressures were becoming a real problem in some parts of the earth, to a large extent through Catholic researchers, and which was only negated because the Pope at the time chickened out of accepting the recommendation of a committee set up by him for that very purpose. It was a cop-out.
However since the Church has made a ruling on the contraceptive pill, what happens to those (very many) married Catholic couples who use it and then stand before the Judgement Seat never having confessed the issue to a priest, mainly because they thought what happened in their bedroom was none of the priest’s, bishop’s or Pope’s business. They’re not the ones who have to raise and support the resulting children, in a world which demands more and more material, energy expensive and infrastructural support.
Yet if Christ’s words were correct, then that ruling is binding in heaven, unless it is “loosed”.
Now as for infallibility, Paul himself had to rebuke Peter, and by extension, what might be called the Magisterium of the time over the circumcision issue (The Jerusalem Council). Peter was already moving towards the error of reverting to the Jewish law. Paul had to confront him.
Say what you like, as far as I’m concerned, the authority does not lie in the church’s self pronouncement that it is “infallible” as regards doctrine, but in Christ’s words to Peter, “What you BIND on earth will be bound in heaven, and what you LOOSE on earth will be loosed in heaven.”
Obviously I think the errors will be relatively rare, but I’m sceptical that the church is always “right”. It used to think nothing of burning witches and heretics. Saying the state carried out the sentence is sophistry. The Inquisition tortured and killed all manner of people, and this was done with the connivance of the Church. Instead of the Church reforming itself in response to complaints about abuses all over Europe in the late Middle Ages, it stuffed around and stuffed around until it was too late.
Sorry, but I don’t accept the Church is always right. Like I said I think it’s wrong about the Contraceptive Pill (for married couples). And that’s an important issue in a world where thousands of children die every day from starvation.