“Those who blasphemed and back away from the ways of Allah and die as blasphemers, Allah shall not forgive them.” [Qur'an 4:48]
“Let there be no compulsion in the religion: Clearly the Right Path (i.e. Islam) is distinct from the crooked path.” [Qur'an 2:256]
Source : http://iranianatheist.com
If you, yes you reading this post were born and raised in Iran, if you were living there currently by Islamic law you could potentially be killed as an atheist. I dont think I really need to say anything else...