I agree with most of the above. If you’re well versed in Church teaching and can separate the false from the good then there may be something to be gained from reading non-Catholic writers.
I have a great love for some of Lewis’ works, and reread The Screwtape Letters and The Great Divorce regularly because I find they point my mind towards God in a way that few other things I’ve read are able to manage. There are theological issues to be sure, but they don’t harm my faith any because I just recognize that they are issues on which Lewis was not properly formed.
There is an excellent book written by a formerly-Protestant pastor on the origin of the Bible. (I believe writing the book actually lead him to become Catholic, but I may be wrong about that.) It was written but a Protestant but is very accurate with it’s expression of how the Bible came into being.
Similarly, there are many youtube channels run by Protestants which are exploring the historical evidence for the OT. There’s one show I watched just recently where the man examines new evidence for an actual, physical location of Eden. These videos are focused primarily on the historicity of the Bible, rather than on teaching, and I find them to be deeply informative, despite being written/filmed by non-Catholics.
(In case anyone is interested, here’s that video. He makes a pretty convincing argument. )
You just have to be careful. If a book is causing you to question your faith then set it aside and seek answers to the questions it has raised.