I watched the video and there seems little doubt that the creationist movement is blatantly out to capture the hearts and minds of children from a very early age.
Indoctrination is the name of the game.
That is pretty terrifying.
I don't think that fighting propoganda with propoganda is the right response however.
If you simply tell young children that evolution is true because scientists say so that really is no better than the creationist tactic.
However the arguments as to why evolution is true are probably too complex for the very young.
Ideally children need to be taught that different people believe different things. That there are good reasons for believing in things and bad reasons for believing in things. That you should always question why something is true.
That any belief derived from a book/person/organisation simply telling you something is true is almost always going to be a bad reason to believe.
However, again, most of this is probably beyond the comprehension of small children.
So in summary I don't know what the answer is.
Sorry to be so long-windedly unhelpful.