So those are some questions for you. Now, I will answer one question that you raise:
And a woman named Renata asked: "Why [take the oath] on the Bible? Why not on the Constitution?" And I think that is a Very Good Question.It's a very easy question. The President must swear to "preserve, protect and defend the Constitution of the United States." There would be no safeguard against lying if you swore on the document you were swearing to uphold. If he doesn't intend to respect the document, he has his hand on a document he doesn't respect.