Interesting...
First of all, mabye I should watch your other lesson.
Second, this is very enlightening, especially considering that I had never even heard of sacred geometry before. your were able to shink it into a managable concept, while still allowing it to expand upon our absorbing it.
Third, It is wonderful to see a cohesive discussion of science, religion, their relation, and, most notably, the implication that they are one and the same (this being one of my own beliefs). I haven't seen or heard many of those.
Fourth, aliens? Seriously? Personally, I don't choose to believe or disbelieve in the existence of alien life with technology advanced enough either to travel here from outside our range of detection of life, or to stay concealed in our astronomical backyard. But even with the semi-relevance of that crop circle tidbit, I don't think the alien reference was quite necessary.
All in all, even with your relatively small time limit on this presentation, you sparked ideas on all of our minds, even if those ideas were simply ones of denial (or conviction, depending on your point of view).