If millions of my neighbors get the same education and are given the same opportunities as I was, whether by chance or other's efforts they too will "get through the bullshit". And as a bonus, they will be less superstitious because they will believe in their own agency and not that of invisible gods or spirits.
My central point is that superstition is not the cause of our relative backwardness in world standards of wealth/health and equality, neither is it a contributing factor. It's merely a symptom.
Superstition is a symptom of poor means, not a cause of them. Therefore the central point of your statement being that "If we can remove one or two of these superstitions, then uplifting African society will be so much easier" is ridiculous.
Take any African child, give him food, shelter and an education (Hello Maslow). See how fast he will drop his belief that his uncle or grandfather bewitched him. I wish I had a better argument to make than saying that I am a product of that transition and I see it playing out everyday in every corner of my country and the neighboring countries with the same start and end.
To expand a little on that, we do not need "truth". An African child in my experience needs food first, then shelter, then books and pencils which in my corner of the world cost $10 for one child for a year. When that child has the basics of education pat down, he will now seek knowledge(truth?), he will now have use and time for the latest rasberry pi powered widget and so on.
One of the best things I have seen to work wonders around these parts are the school feeding programs we have in very few locations. You see these programs take care of the food aspect and the poorest of parents are inspired to take their children to school, chiefly because the child can now have food (priority 1) while also learning (priority x based on the parent's education level/social beliefs and so on).
OLPC atleast from my take on it is the equivalent of throwing a suitcase of money to a drowning man. Yes, once he is out of the water he will love it, but it is of little utility when his priority is just the next breath or the next day in the lives of African kids.