My opponent is basing his argument that science is a religion on his own personal belief system. You cannot use one belief system to prove or disprove another.
Creationism is not only bad science, it is bad religion, because it leads to the public's perception of religion as antiscience and anti-intellectual.
Every scrap of scientific logic from Darwin to the modern writers indicates that the theory of evolution is as scientific as any other well-known scientific theory. Most Christian denominations have no problem with evolution, agreeing that it is science. As a science, evolution has a place in the public schools. Since creationism is not science it cannot be taught as an alternative theory to evolution.
References and Suggested Reading
Evolution vs. ID Home