If we are honest - and scientists have to be - we must admit that religion is a jumble of false assertions, with no basis in reality. The very idea of God is a product of the human imagination. If religion is still being taught, it is by no means because its ideas still convince us, but simply because some of us want to keep the lower classes quiet.
Public prayer is not intended to promote religious values, but to enhance the authority of some churches and some political views over others. Similarly with the posting of the Ten Commandments. It is about power, not about religion. Government by Christian or Islamic or any other faith has rarely been progressive. And the Constitution clearly intends that there should be freedom from religion.