Antitheist

[Merna]

An antitheist is one who is strongly apposed to the belif and following of theism and belives that it is detremental to society. More or less a hardcore atheist.

[Justin Bieber]

A person {often, but not always an [atheist] } who believes [religion] and/or [theism] to be a detriment to society
an active atheist, usually publicly denouncing religion, theism, and churches/mosques
Someone with a brain

[Donald Trump]

Antitheism is an opposition to theism, an antitheist is one who practices antitheism.

[Justin Bieber]

An [atheist idiot] with such an [irrational hatred] for [theism] that they actively oppose it aggressively. They are so brain washed by their atheist propaganda that they actually think that science debunks God.

[Rihanna]

An extreme [atheist], one who has unshakable faith in the absence of God,

one who is very [athy] with regards to [atheism].

[Tanya Shivari]

Opposed to belief in the existence of a god or gods.