Science differs from religion because it is the nature of science to test and retest explanations against the natural world. Thus, scientific explanations are likely to be built on and modified with new information and new ways of looking at old information. This is quite different from most religious beliefs. Science is a way of knowing about the natural world. It is limited to explaining the natural world through natural causes.
Science can say nothing about the supernatural.
Whether God exists or not is a question about which science is neutral. Because public schools must be religiously neutral under the U.S. Constitution, the courts have held that it is unconstitutional to present creation science as legitimate scholarship. Teachers' organizations such as the National Science Teachers Association, the National Association of Biology Teachers, the National Science Education Leadership Association, and many others also have rejected the science and pedagogy of creation science and have strongly discouraged its presentation in the public schools. But a science curriculum should cover science, not the religious views of particular groups or individuals. Some religious groups deny that microorganisms cause disease, but the science curriculum should not therefore be altered to reflect this belief.