The threat was clearly implied, whether you admit it or not. To ask for a student to provide the scientific explaination for the origin of humans is one thing. To ask a student to 'truthfully and forthrightly affirm a scientific answer' is repugnant and bigoted in my book. I see no different than forcing a student to truthfully and forthrightly affirm their worship of satan. It is a religous test, not a scientific one.
So what in affirming acceptance of evolution denies a creator?