No, it violates the Establishment Clause of the first amendment which states that government shall not promote one religion over another and respect all religions and beliefs equally. Swearing in on the bible directly promotes the Christian religion as being more important than any other to the government and that a Christian should be president. This is a travesty really. But nobody will call em on it because they're all Christian and so is the majority of this country so they get away with violating the constitution.

In order for this to be fixed the president should either swear in on nothing with just his hand raised in oath or on a secular article (on a folded American flag for example) OR he must swear in multiple times on every holy book or writing for every religion ever to respect all of them which is impossible.

The Bible tells the story of God and Satan from the villain's point of view (God).

The president of the United States ought to be beholden first and foremost to the Constitution and Bill of Rights. The personal faith of any president should be secondary to service of their country and the interests of all of the constituents whom they represent, not just Christians. An oath upon the Bible makes that oath utterly meaningless to those who do not share the Christian faith. Truthfully, however, it matters very little what the president or any other elected official swears upon as evidenced by how infrequently they adhere to that oath anyways. I advocate for the swearing in on legal documents merely as a matter of principle, not because I am so naive as to believe it would actually make politicians more dutiful and loyal to their constituencies.

I don't think it is necessary. A President may not want to be a show-off, therefore, he may not want to swear on a Bible.