I am all for private religious schools. I would never allow my kids to go to a public school if there was any kind of alternative. But thats not the same thing as teaching that science is wrong. Evolution is no more theoretical than the Earth being spherical.
The empirical force of theories is on a sliding scale, and aspects within the theory have their own sliding scale. I would suggest and assert that emphasing what is unknown is equally as important as what is known. A belief in certainly where none exists can lead to hubris.
Do I believe in intelligent design? No. I am a near atheist. Do I believe there is any empirical evidence for it that is testable by the scientific method? No. Are there some elements of the evolutionary theory that will be so testable in my lifetime? No. Will we discover the origin of life in my lifetime, as it were, via the scientific method? No. So what?