Some people think the Bible or Quran was written by the infinitely intelligent creator of the universe.

I think this is a failure of imagination.

What do I mean?
Like really, you don't think such a being would write a better book?

Imagine a book that you could read both forwards and backwards. As in, the letters in all the words just so happen to be arranged such that the book could be meaningfully read both ways with different messages. That alone would be insane. But then also the chapter titles formed an acrostic and the whole book rhymed.

Oh and the book contains so much scientific and mathematical knowledge that it would make scientists and mathematicians irrelevant for hundreds of years.

Oh and the book is so beautifully written that human beings 99% of the time cry and convert upon reading it.

Imagine a book that not only gives fantastic advice on current issues, with all their nuances and sub-nuances, but gives detailed advice about situations that will not occur for thousands of years.

Oh and it gives detailed advice about how to interpret it, so there are no feuds about the correct way to interpret it.

An infinitely intelligent God could definitely write such a book.
So why would he give us... the Bible or the Quran?

If your response to this is, "Oh, a limited mind could never comprehend what an infinite mind would create," then you are committed to believing that if, if the Bible/Quran consisted of hundreds of pages saying, "I, Lord Poopy Butt, commandeth you to rub poop on your poopy faces, throw poop at each other, roll around in poop, and make poop hats..." you couldn’t say, "I don’t think an infinite mind would create that..." Instead, you’d have to say, "A limited being like me could never know what an infinite mind might do."