I initially thought that this was going to be serious question. Sadly it turned out to be a backhanded attempt to discredit the “holiest” prophet in one of the planet’s most popular fallacies.
If we are going to address the issues raised then;
Yes the sexual pursuit of children is abhorrent and we ought to be outraged. The rejection of paedophilia is visceral.
Islam is, in its entirety, a falsehood. I find arguing with religious people is like bashing your head against a brick wall; it feels great when you stop. If Muhammad married a nine year old, then so be it. He qualifies by today’s standards as a paedophile irrespective of the motivations underpinning the marriage. Is there any point being morally outraged at the distance of a number of centuries? Probably not.