Because simply there is nothing in scripture saying what books are canon. So the ruling of what books are in the bible is all tradition ruled by the Church. That is what it has to do with it.
You are refusing to say "no, it's not in scripture" and just throw out this smoke screen about faith. At the end, it all spells out that you still have faith in something not found or stated in scripture leaving your whole case in this thread as hypocritical.
No, but he also gave his word through other mediums not just writing. Also, this reasoning of yours is the reasoning that Muslims, JW's, and Mormons use to support their religious books. Many muslims believe that the NT is corrupted by the Catholic Church - the Mormons believe this too. So God guided his word hence the Quran and the Book of Mormon being "divine inspired".
None of what i gave are suggestions, they are questions against your reasoning. For example, you say 66 books.. no where in scripture does it tell you that bible is 66 books only yet you just go on with having faith that it is right. Guess what, you are not following scripture but following the tradition of the church.
I believe Sola Scriptura has lead more people away from God. That is why there is over 5,000 denominations right now, yours included and being a denomination that was born in the late 1800's, more than a thousand years after the events in Pentecost.
traditions of men doesn't mean religious traditions or church traditions. The "traditions of men" that is talked negatively about in scripture are simply habits of vanity in where people cared more about following certain religious laws only for glamour and to justify their conceit. For example, not allowing a homeless man to eat or even sleep in the churches due to laws about how God's house has to be completely pure. These are traditional views yet it is coming over things such as humanitarianism.. which God cares more about. God does want to be surrounded by purity, as shown in the burning bush when Moses had to remove his sandals.. but at the same time he does not shun out those who are in great need to live and be saved. That is the meaning of "man made traditions over God".