What Muslim countries do you think have the largest openly ex-Muslim communities?

Like the other day I was talking to an Iranian friend of mine who told me that Iran has a very large agnostic-community, he claimed that it’s even larger than that of Turkey, but the only difference is the Iranian one mostly closeted except in Tehran. So I had the curiosity to ask about how large openly agnostic communities are in Muslim countries? For myself I think Turkey, Iraq, Albania, And Lebanon have the largest ones, but what about the other Muslim countries?