They don't deviate. It is just like the harmony of the Scripture. If you believe that the words of St. Paul are something other than subservient to and in support of the Synoptic Gospels the error is yours, not Scripture's. If that is what you perceive that the doctrines and dogma of the Church deviate then your understanding of Scripture or the Catechisms, creeds, Sacraments and decrees of the Magisterisum is what is flawed.
Oh man I don't even know where to begin with that one. LOL!
I could be here all day and into tomorrow and the next and the next posting item by item deviations - LOL. Its easier to just put up a chart or something. I did find one that I checked the 'banned' list for, and I don't see anywhere on that list that chart from biblestudycharts.com are a 'no-no' so here goes:
A Timeline of.... You will need to go to page 2, I don't intend for you to purchase the chart!
If banned, please accept apologies in advance as I did check the list!
I would suggest that the reason most Catholics don't believe their magisterium deviates in any way from the Word of God is that they are not allowed to see any! And any that are seen are explained, spun, dusted, cleaned, whatever, just so long as THE MAGISTERIUM IS NEVER, EVER QUESTIONED!
It all gets back to AUTHORITY again NL. Is it, the magisterium, decrees, catechisms, sacraments, et al. Or is it Holy Scripture? So I'll direct this question to you also:
Who, or what is your FINAL AUTHORITY on matters of faith?