The arguments are not over the canon (mostly, Orthodox have 88 books, Catholic have 72, Protestant 66, Jewish have OT only - progressively tighter criteria for canonicity). As R.C. Sproul put it, "we have a fallible canon of infallible books". While Catholics/Orthodox complain about Protestants "throwing out" books (actually, they are read in church, used in Bible study, but just not regarded as canon), I think it is a good idea to start with the subset agreed on by absolutely everyone. Note that Catholic/Protestant/Orthodox all agree on the New Testament canon - although Luther considered ditching e.g. James ("an epistle of straw!") because the content didn't fit neatly with his preaching.

Many of the arguments are not even real arguments - but a failure to listen to the other side. For instance, the Protestant slogan "sola fide" (faith alone) is entirely acceptable to Catholic/Orthodox if modified to "sola fide formata". The issue is that "faith" or "belief" is used in two senses in the NT canon. Fide informis (intellectual assent) vs Fide formata (action based on faith). In fact, the phrase "sola fide", or "faith alone" in English only appears one place in the NT, in James, where he says, "therefore a man is justified by works, and not by faith alone". But there James is talking about fide informis. As he says shortly before, "You believe that this is one God? The demons also believe and tremble." One way of qualifying in English is "believing that" vs "believing in".

Charles Blondin was a famous French acrobat known for walking a tight rope across dangerous terrain. On his US tour, he walked across Niagra Falls. At each performance, he would ask the crowd, "Do you believe I can walk to the other side and back on that tightrope?" "Yes!" the crowd would reply. And after working the excitement to a satisfactory pitch, he would proceed to do exactly that, often adding additional stunts en route.

One time, he asked the crowd, "Do you believe I can carry a man on my back to the other side and back on that tightrope?" "Yes!" the crowed screamed, excitement building as usual. "I need one brave soul to volunteer for the trip!" Crickets. Finally, his business manager volunteered, and the feat was performed as promised. The crowd believed THAT he could do it. The business manager believed IN the ability of Charles to do so.