Yes the Catholic church abused the poor and ignorant.The funny thing is that the Catholic Church claims to establish its belief in Purgatory based upon what is written in 2 Maccabees 12:45,46 -- an apocryphal book -- where nothing is said about Purgatory, but only Jews mistakenly praying for the dead (since nothing in the OT alludes to praying for the dead).
And because he [Judas Maccabeus] considered that they who had fallen asleep with godliness, had great grace laid up for them. It is therefore a holy and wholesome thought to pray for the dead, that they may be loosed from sins. (Douay-Rheims Bible)
Judas Maccabeus -- like many Jews - mistakenly believed that those who died without Christ still had "great grace laid up for them", based upon their "godliness". Therefore he recommended prayers for the dead "that they may be loosed from their sins". So on one hand they were presumably godly (therefore under grace), and on the other hand they needed to be freed from the penalty for their sins. This in itself should have been a red flag. As we can see, this is contradictory, yet the Catholic Church had no problem taking this passage and concocting a whole "Christian" doctrine out of the words of an unbelieving Jew. Then adding the false teaching about indulgences, so that Purgatory became a "cash cow".
That's why God loosed the anarchy of Protestants to punish the Roman church and set about change.
The Latin church became better for it.
But the Apostles taught Purgatory.
So do you not believe in oral traditions?
If no.
How did the Jews pass on the Torah?
Whether in Spain, Russia, Israel, Etc.
They all kept the oral traditions alive and the same.
Proof the possibility of keeping an oral tradition alive and well.