Do you think Muslims will dominate the world again like they used before?

[Mister Agenda]

Modernity does tend to make most people have fewer children. When children make you poorer instead of richer, people tend to find ways to justify having fewer despite what their religion may teach. Considering they're not supposed to use artificial birth control, the average size of Catholic families in the USA has certainly gotten a lot smaller in the last 40 years.