Hate to disagree, but methinks you are very wrong. Darwin was a stealth atheist. He always was an atheist, but never admitted it in public. He was surrounded by atheists such as Huxley and Haeckel. Marx wanted to dedicate Das Kapital to Darwin, but Darwin refused not wishing to be 'outed'. The biggest proponents of evolution nowadays, Gould and Dawkins are themselves rabid atheists. I agree that there are indeed some true Christians that do believe in evolution. However, they do it at tremendous peril to their faith because evolution was designed by atheists to lead others into atheism.
Regardless of Darwin's beliefs, his Theory of Evolution has a certain amount of scientific validity but is often used to extrapolate things far beyond what it meaningfully can.
As a simple example, imagine that you find pieces of what appear to be a 1980's Coke bottle on a concrete sidewalk near a 20-story building with an observation deck on the roof. A reasonable hypothesis would be that someone in or on the building dropped the bottle and it smashed on the ground. Analysis of the pieces of glass and the properties thereof, along with examination of the sidewalk where the glass hit and Newton's equations of motion, may allow one to determine that the object fell from a height of about 240 feet. This would tend to support and refine the hypothesis, suggesting that the bottle was probably thrown from the observation deck. It would not prove it, however, as the bottle could have been launched into the air via other means (sling-shot from the ground, perhaps?) and produced for all practical purposes the exact same pattern of broken glass.
Darwin's Theory of Evolution provides some means of predicting future events and the consequences of certain actions; it has useful implications in fields like zoology, especially with regard to breeding of endangered animals. It is not, however, able to provide an infallible interpretation of the past, nor is it able to define any moral consequences for anything (it may predict that certain actions increase the likelihood of species A surviving while decreasing the likelihood for species B; it does not say whether that's a good or a bad thing).
IMHO, students should be taught Darwin's theory, but should be informed what aspects are confirmably true and what claimed aspects are in fact groundless extrapolations.