Evolution can be observed in the field and in the laboratory. The origin of life, as far as I'm aware, can't be.
While it is arguable that evolution can be observed in the laboratory (genetic mutation leading to extinction of the test subjects rather than adaptation to their environment is hardly the same as "evolution" IMHO) it is a different discussion. Ultimately, the irony to me is that evolution is so often paraded out as somehow a "counter" against creation, when evolution does not explain the origin of life nor attempt to.
Ultimately the origins of life cannot be proven at this point, whether one believes it to be the result of chemicals (which somehow, were in the right combinations in the right place, etc etc to make an organism with a DNA program complex enough that not only conducts all the processes of life, but just happens to allow it to adapt) or if you believe these were intentionally arranged.
Personally, I don't see fire next to iron ore producing steel as evidence my truck was not built by a factory, either, but of course I understand such is not so simple, and that is a decision we each have to make.
There simply isn't enough evidence to teach that any of these options was or was not the origin of life,
and more importantly (and on topic) teaching one or the other, so long as it is not exclusive of other theories, should be ok, but teaching one unproven theory at the expense of another when neither has a preponderance of evidence to support it or at least disprove the other....well, is not education. Education should be keyed toward those who can think for themselves rather than simply believing whatever the state spoon feeds them this week because it happens to be the current dogma....
This has gotten so off-topic, but mostly I feel one theory should not be taught as "correct" and another not, when neither has been proven. To do so, is to give credence to that which has not earned it.