What will happen to a Muslim if he or she doesn want to be Muslim any more?
Each person has the right to complete freedom of belief. “Let there be no compulsion in religion”. (Surah al Baqarah, Chapter 2 verse 256). There is an idea that Islam advocates killing apostates. Fighting – and killing- is only permitted against those individuals who fight -and kill- the Muslims. This is so whether or not they used to be considered Muslims.