1) Heretic 2) Swearer 1) Impious one 2) Irreverent one 3) Nonreligious person 4) One who reviles 
Blasphemy is the act of insulting or showing contempt or lack of reverence for a religious deity or the irreverence towards religious or holy persons or things, or toward something considered sacred or inviolable. Blasphemer may also refer to: == See also == ...
• (n.) One who blasphemes.
Blas·phem'er noun One who blasphemes. « And each blasphemer quite escape the rod, Because the insult's not on man, but God ? Pope. » 
[n] - a person who speaks disrespectfully of sacred things
blasphemer 1. A person who speaks disrespectfully of sacred things. 2. To speak of or to address with irreverence.
[Wuthering Heights] one who speaks irreverently or profanely of or to God.
noun a person who speaks disrespectfully of sacred things