I found it interesting that the article claims that the fertility rates among Muslims, in particular, is dropping.
Almost all material that I’ve read contradicts the assertion. They’re multiplying like roaches.
We're talking about fertility rates of Muslims in Israel and the West Bank only and comparing those rates over time. Muslims in Israel and Israeli controlled territories have improved socioeconomic conditions compared to Muslims in predominantly Muslim countries, so their fertility rates in Israel are going down with time. This doesn't mean that the Muslim fertility rate in Israel isn't still significantly higher than the Jewish fertility rate in Israel. It's just that the gap is narrowing with time.
Iran has dropped to replacement level, 2.0 kids, from 5+. Other Muslim nations like Morrocco and Lebanon are at that level. For other Muslim nations, the rate has dropped rapidly, but falling in half still leaves them with population growth. Many Muslim nations are still producing 3+ kids per family. That’s a drop in fertility rates but doesn’t stop population growth.