No, it's not part of Islamic history, it is part of Islamic theology.
Most Muslims are Sunni, and within Sunni Islam there are 4 schools of jurisprudence. All four of these schools have deemed it acceptable to marry a girl off as soon as she is born, and hand her over to her rapist when she turns 9 years old or bleeds.
While most Muslims are anti pedophilia, the Islamic sources and clerics are not. It is a huge problem where I'm from.
To be fair, every single project regardless of proprietary or open source has a backlog like that. It's just that open source projects show the backlog and don't have marketing people telling what is and is not in the backlog.