An excellent video, aside from the "conclusion". Specifically, critical thinking is absolutely not "I can't figure out how this could happen without God, so I guess God did it." Truly annoying. Critical thinking in the context of the video is trying to figure out how natural processes could have made such an engine, and if you can't figure it out, admitting that you don't know. But that's way, way, way too hard for too many people to do -- either putting in the immense amount of work necessary to figure it out, or to have the humility to admit that they are not smart enough to have figured it out on their own.
And, yeah, there are tons of things that even the smartest people in the world have been working on for decades and still can't figure out. Doesn't mean "God did it" -- it means it will take even more smart people even longer to figure it out, or that maybe it's so difficult that it's beyond human capacity to understand. There are plenty of magicians that perform "magic" tricks that I would never figure out on my own, or even with a lot of help -- doesn't mean it's magic.