Fantastic job here by @jaketapper. He literally stunned Ted Crockett's with facts. But let's dig into Crockett's theocratic lunacy a bit deeper because he's even more wrong than Tapper pointed out. /1
Tapper's correct, there is no law that says you have to swear on a bible. There is, however, a law that would nullify and biblical requirement or rule, it's called the Constitution. Article 6 Clause 3 is the supreme law of our land and it prohibits religious tests for office. /2 
The Constitution also lays out only one oath of office, the President's. It does not mention the bible and conspicuously omits the words, "so help me God." The oath doesn't even require the president to swear, he can affirm. Wholly secular oath and an affirmation option.
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Presidents didn't start adding religious language to the oath—also known as amending the constitutionally required oath as one is swearing to uphold it—until (probably) Chester A. Arthur and (without doubt) FDR.
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Not all presidents have sworn in on a bible. John Q. Adams took his oath on a stack of law books. So Tapper's correct, there is not bible requirement and we do have a separation of state in church in this country. Oh, I debated @BillOReilly about this
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