I was kinda raised Muslim. Many members of my family would fast during Ramadan (sometimes I would do). No-one ate pork, even the irreligious family members. I definitely believed that Islam seemed like the most likely religion to be true. Christianity is divided and the trinity in nonsensical, Hinduism, Buddhism and other Eastern religions seemed silly, Judaism was too limited in number to be true, etc. But then when I started reading the Quran and researching religion (I was 16 at the time), I became irreligious within only a few weeks. I also read the Bible and other religious texts, and books by Richard Dawkins and Christopher Hitchens (rest in peace).
No one knows for sure the religious composition of Bosnia. The last census was back in 1996. But according to Wikipedia, in 2001 45% of Bosnia was Muslim. By now it is probably around 50%, since the Federation has a higher population growth rate than the RS.