So what? It STILL doesn’t mean that a girl’s body is fully mature at that moment, and that she is done growing. Having a baby at that age isn’t good for her no matter what *custom* is.
It doesn’t matter what people have done throughout the ages.
It doesn’t change the facts.
You have been missing a very important aspect of this subject.
In their religion, they believe in what thousands of years of history have taught, and that a woman can be married after her first menstrual cycle.
You are making a judgment, using your own life experience and religious teachings.
These are not the same as their beliefs.
At the moment, thousands of years of history is on their side of the debate.