“...told us many times they don’t believe the Bible...”
Anecdotal information, and false as well, even it was a priest who said it.
Every single Catholic doctrine is backed up by scriptural proof - every single one. Just read for example St. Thomas Aquinas who ALWAYS cites scripture to back up his (Catholic) positions. Not one statement in the Catechism is made without a scriptural back-up - not one. Procure an actual copy, read it, look up the biblical cross-references in the footnotes, and then let me know how unscriptural we are.
The idea that Catholics don’t read and understand Scripture is a myth used by Proetestants to vilify us.
That’s remarkable.
But I won’t.