Uranus also spin backwards. My mistake it is 2 planets and 11 moons, not three planets, though some scientists speculate that Pluto might also spin backwards.
The Law of Conservation of Angular Momentum sates:
If a spinning object breaks apart in a frictionless Environment, which the Big Bang certainly would have been, the fragments that break off are going to spin in the same direction. This is because the outside of the object is moving faster than the inside.
Now if the universe used to be in one spinning dot, then you have a problem, all matter should be rotating the same way. Now obviously I'm not talking about us I mean on moon sized scale, because we exist in a frictional environment than this law does not apply to us, but it does apply to moons and planets and other large objects.
"Anyway - how is that any proof of "intelligent design"? Why would an intelligent designer create a solar system with such blatant abnormalities in the first place?"
If the universe was created by the Big Bang and not God all planets should rotate in the same direction. Having 13 objects in the solar system go backwards shows that this can't be the case and since the amount of force required to cause a planet to reverse direction is way more than is needed to destroy it, it had to be made that way. Since it couldn’t have in a non-intelligent creation it needs an intelligent environment.
Thanks for your thoughts.