The truth is that religion, as we speak of it (Islam, Christianity, Judaism), is based on the claim that God dictates certain books. He doesn't code software; he doesn't produce films; he doesn't score symphonies. He is an author. And this claim has achieved credibility because these works are so profound that they could not possibly have been written by human authors.
How difficult would it be to improve the Bible?
Anyone in this room could improve the supposedly inerrant text scientifically, historically, ethically, or spiritually in a moment.
OK, so let's try to improve the Bible. I'll start by suggesting that the following passage be deleted.
If thy brother, the son of thy mother, or thy son, or thy daughter, or the wife of thy bosom, or thy friend, which is as thine own soul, entice thee secretly, saying, Let us go and serve other gods, which thou hast not known, thou, nor thy fathers;
Namely, of the gods of the people which are round about you, nigh unto thee, or far off from thee, from the one end of the earth even unto the other end of the earth;
Thou shalt not consent unto him, nor hearken unto him; neither shall thine eye pity him, neither shalt thou spare, neither shalt thou conceal him:
But thou shalt surely kill him; thine hand shall be first upon him to put him to death, and afterwards the hand of all the people.
And thou shalt stone him with stones, that he die. Deuteronomy 13:6-10
That's much better. A kind and loving God wouldn't tell us to kill our family and friends for disagreeing with us about religion.
What about the Quran? Could that be improved?
How about removing this verse?
Men are in charge of women, because Allah hath made the one of them to excel the other, and because they spend of their property (for the support of women). So good women are the obedient, guarding in secret that which Allah hath guarded. As for those from whom ye fear rebellion, admonish them and banish them to beds apart, and scourge them. Then if they obey you, seek not a way against them. Lo! Allah is ever High, Exalted, Great. Quran 4:34
There. Now men can't claim it's OK to beat their wives for being disobedient. That's quite an improvement, I'd say.
And now for the Book of Mormon.
I nominate the following verses for removal.
And he had caused the cursing to come upon them, yea, even a sore cursing, because of their iniquity. For behold, they had hardened their hearts against him, that they had become like unto a flint; wherefore, as they were white, and exceedingly fair and delightsome, that they might not be enticing unto my people the Lord God did cause a skin of blackness to come upon them.
And thus saith the Lord God: I will cause that they shall be loathsome unto thy people, save they shall repent of their iniquities.
And cursed shall be the seed of him that mixeth with their seed; for they shall be cursed even with the same cursing. And the Lord spake it, and it was done. 2 Nephi 5:21-23
And now it's your turn. Spend a few minutes improving these three perfect books.