There is much more Bible reading at a Catholic Mass than at any of the CoC services that I’ve attended - both conservative and liberal wings. Furthermore, Catholics cover the entire Bible every three years from Genesis to Revelation during Mass.
And this does not include any further Bible study that takes place.
Each church of Christ is autonomous and independent. So it is not far-fetched to imagine finding one that has lost The Way. After all, look at the seven churches described in the Revelation.
Each congregation - its elders, deacons and members - is responsible to ensure that it follows Biblical practices. If my congregation were to go off the deep end, I would dissociate with it and either attend a different one, or start a new church of Christ with like-minded believers.
If I and other like-minded believers started a new congregation, the new, Biblically-focused congregation and the old, non-Biblical congregation would both exist, and both carry the name church of Christ. But only the new one would actually be a church of Christ congregation.
I know this is all very confusing to denominational folks. It was to me at first, too (I am a former denominational person). To understand it all, it’s important to understand that each congregation is truly independent in all ways. Each congregation fulfills its duties - including the great commission - in its own manner and according to its own means. Hence you will find no central authority or structure. A church of Christ is recognized not by its name, but by its adherence to the Word.