The reason is that elevating any standard, any religion, any text to the level of the sacred means that that it is above any individual. Therefore, what any one individual or even society believes is of secondary importance to that which is deemed sacred. If, to cite the most obvious example, the Bible is sacred, then I have to revere it more than I revere my own feelings in assessing what is right and wrong.
But for the left, what is right and wrong is determined by every individual’s feelings, not by anything above the individual.
This is a major reason why the left, since Karl Marx, has been so opposed to Judeo-Christian religion. For Judaism and Christianity, God and the Bible are above the self. Indeed, Western civilization was built on the idea that the individual and society are morally accountable to God and to the moral demands of that book. That was the view, incidentally, of every one of the Founders including deists such as Thomas Jefferson and Benjamin Franklin.
This is entirely unacceptable to the left. As Marx and Engels said, “Man is God, and God is man.” Therefore, society must rid itself of the sacred, i.e., God and the Bible. Then each of us (or the society, party or judiciary) takes the place of God and the Bible.
