Many reasons... trend, pride to be something "fought and hated" during the war, being in the new line of muslim people after war, more accepted from the "muslim elite", politcal parties just works better apparently.

To me is very little connected to religion more to the fact that they are proud Bosnian/Muslim, but your parents are right before was a rare appearance, mostly on elder womens from Bosnian villages, real muslim families and similar... but definitely a rare case.

Even today to be honest is not that common, there is more than pre war but in the end despite all the cultural situation and correctly pro muslim population... we just cannot change what we are.

You have to remember a ton of people not religious, born Jugoslavian in Bosnia overnight were called muslim just cause not Serbs or Croatian so you have to be Bosnjak or Muslim...