Can the church believe something that has not been ruled on yet and is still being discerned, developed?
The doctrines of the faith were whole and entire when they were delivered to the Church, so nothing can be "ruled upon’ or “developed” that was not already present.
Were those Catholic monks who strongly opposed the Immaculate Conception heretics because the Church much later ruled on the matter?
I am not sure you are asking this just to be ornery, or not. Such a situation does not meet the definition of heresy. Besides that, not ever member of the Church will be persuaded on matters of doctrine, but the Truth is not defined by those who do not hold it. If this were the case, we would all be Arian!
Were certain monks in France heretics for arguing with other French monks about communion because much later (centuries) the Church made a final ruling?
I think you are just being obtuse here, because I have a hard time believing you are really ignorant of the definition of heresy.
The Church rules on matters specifically to PREVENT the faithful from falling into error.
Your take that Reform (1500) must not be of God because that would be poor HG guidance and leading into all truth, and letting the devil prevail,
We don’t take all “reform” this way. There were plenty of reformation voices that were obedient to the Church before, during, and after the rebellion. the Counter -Reformation is certainly considered to be the movement of the HS, as are the Councils prior to it.
There have been voices of opposition from the beginning. Those who denied the doctrines of the faith were considered heretics. The One Church cannot be successfully reformed working through heresy.
And Jesus said both teenagers and parents are worse than stupid if they are not like “little children”.
I agree, but a hostile attitude toward the authority He appointed is hardly docile to learning!
Age should be superior in wisdom, according to the words of the youngster Elihu in the book of Job…but not always so, for God puts understanding in the heart of an individual, irrespective of age at times.
Yes, but understanding, as Jesus had as a child, does not equate to disobedience. Rebellion and defiance is not wisdom.
and I suppose some might say the same shoe also fits for the younger reform churches and the older parent church.
Perhaps in some ways, yes, there is good fruit, but there is also the fruit of division, which is the fruit of the heresy that produced it. This fruit, born of a bad tree, continues to proliferate.
Being wrong and being heretic can be two different things.
So are you being trollish deliberately?