In our practical preaching work we meet many Christians who talk about statements of the Bible. When we question whether God is limited or unlimited, Christian priests say that God is unlimited. But when we question why the unlimited God should have only one son and not unlimited sons, they are unable to answer. Similarly, from a scientific point of view, the answers of the Old Testament, New Testament and Koran to many questions have changed. But a śāstra cannot change at a person’s whim. All śāstras must be free from the four defects of human nature. The statements of śāstras must be correct for all time.
The śāstras of the yavanas, or meat-eaters, are not eternal scriptures. They have been fashioned recently, and sometimes they contradict one another. The scriptures of the yavanas are three: the Old Testament, the New Testament and the Koran. Their compilation has a history; they are not eternal like the Vedic knowledge. Therefore although they have their arguments and reasonings, they are not very sound and transcendental. As such, modern people advanced in science and philosophy deem these scriptures unacceptable.
Sometimes Christian priests come to us inquiring, “Why are our followers neglecting our scriptures and accepting yours?” But when we ask them, “Your Bible says, ‘Do not kill.’ Why then are you killing so many animals daily?” they cannot answer. Some of them imperfectly answer that the animals have no souls. But then we ask them, “How do you know that animals have no souls? Animals and children are of the same nature. Does this mean that the children of human society also have no souls?” According to the Vedic scriptures, within the body is the owner of the body, the soul. Because the soul is within the body, the body changes through so many forms. There is a soul within the body of every living entity, whether animal, tree, bird or human being, and the soul is transmigrating from one type of body to another. When the scriptures of the yavanas-namely, the Old Testament, New Testament and Koran-cannot properly answer inquisitive followers, naturally those advanced in scientific knowledge and philosophy lose faith in such scriptures. The Kazi admitted this while talking with Śrī Caitanya Mahāprabhu. The Kazi was a very intelligent person. He had full knowledge of his position, as stated in the following verse.
Ref >> Srila Prabhupada Vani.