Salam
People who believe in need of books revealed from God can try to make a case for it. Christians, Jews, Muslims, Bahais, Ahmadis, etc, would be on the same side here.
I would think religions who do not believe the need of scripture or deists or atheists who believe if God exists, he would be a deist type, can argue against these.
I will post my proofs after some people participate for and against.
Baha'u'llah answered why there is always a need for a new Guidance from God in every Age:
1.
"As to thy question concerning the heavenly Scriptures: The All-Knowing Physician hath His finger on the pulse of mankind. He perceiveth the disease, and prescribeth, in His unerring wisdom, the remedy.
Every age hath its own problem, and every soul its particular aspiration. The remedy the world needeth in its present-day afflictions can never be the same as that which a subsequent age may require. Be anxiously concerned with the needs of the age ye live in, and centre your deliberations on its exigencies and requirements."
The religion of God, comes as guidence to show the Right way of Life. As each Age has its own conditions and problems, therefore each Age, needs a diffent remedy or solution. And who is more capable than God who is all-knowing to give us this guidance?
This has always been the way of God, and shall always be His way.
2. Another reason that, each Age, the Religion must be renewed is, as time passes, the original teachings of the previous Revelation are misinterpreted and gets distorted. People loose the essence and spirit of the Faith, and instead adhere to the apparent form of the Religion. For example, they may say their Regular Prayers, yet, forget the more essential teachings, such as kindness, fairness, truthfulness, etc, as humanity tend to become materialistic and worldly overtime, therefore a new Warning from God is required from Time to Time.