Maybe not in the sense of being sinful. Its probably just a psychological thing, rationalization/justification.
and to believe that is what the RCC wanted them to believe.
I know lots of folks claim what you claim here.
Usually the fact is that they simply learned NOTHING.
Then they read so much non-Catholic and anti-Catholic crap, they adopt the lies therein as their own memories. Its probably subconscious.
I know this from Catholics like you who left the faith, adopted the anti-Catholic "but this IS what I was taught" crap you describe here, but eventually come to their senses and return to the faith.
Rationalization can do strange things to you.