Observation: the flagellum could not have evolved naturally (IC)
Hypothesis: ID
Test: can the evolutionary path for the flagellum be shown? Yes
Conclusion: the hypothesis fails.
Do you agree that this is what happened?
No, I do not agree that is what happened.
What happened was:
1. The argument from design was put forward as a reason for believing in God centuries ago, because it didn't seem possible that complex life forms could have come into existence purely by chance
2. Darwin made observations which led him to an alternative explanation: that complex life forms were the result of millions of years of evolution by natural selection. Note that the only part chance plays is in the provision of variety, the raw material upon which natural selection acts. Enormous amounts of subsequent observation and consequent understanding of genetics etc have overwhelmingly supported this explanation.
3. Religious people either didn't understand or refused to believe this explanation, and continued to believe that complex life forms could only be the result of divine intervention
4. Religious people with scientific training renamed that divine intervention Intelligent Design, in order to pretend that it was an hypothesis rather than a religious belief, and then
went looking for examples of complexity which they could argue could not be the result of natural selection in a disingenuous enough way that they might attempt to sneak into the scientific literature, thereby giving their religious belief an unwarranted veneer of scientific credibility
5. Scientists systematically demolished their examples
The scientific method is: make observations, produce hypothesis, test hypothesis
What these guys did: form religious belief, pretend religious belief is an hypothesis, make lots of observations until you find one that can be twisted and misinterpreted as support for your religious belief