Why did the population of some Balkan countries like Bosnia and Albania convert to Islam while under Ottoman occupation, while countries like Greece, Bulgaria, and Serbia stayed Christian?

by Tarsus1994
10z20Luka

Until someone provides some further detail in a newer answer, here is an excellent answer from the past.

https://www.reddit.com/r/AskHistorians/comments/19rwlf/why_did_albania_and_bosnia_become_majority_muslim/

EDIT: u/UrbisPreturbis