Regarding our differing of 'definition'. This is the most accurate definitions. I am not debating your reasoning, I do not appreciate an 'anti-theist' as they are CERTAIN and will insult somebody else for their views. Just like a religious person is CERTAIN and in the past, collectives have killed others for their views.
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antitheist
Web definitions
Antitheism is active opposition to theism. The term has had a range of applications; in secular contexts, it typically refers to direct opposition to organized religion or to the belief in any deity, while in a theistic context, it sometimes refers to opposition to a specific god or gods.
http://en.wikipedia.org/wiki/Antitheist-------
atheism
ˈeɪθɪɪz(ə)m/Submit
noun
noun: atheism
1.
disbelief or lack of belief in the existence of God or gods.
synonyms: non-belief, non-theism, disbelief, unbelief, scepticism, doubt, agnosticism, irreligion, godlessness, ungodliness, profaneness, impiety, heresy, apostasy, paganism, heathenism, freethinking, nihilism More
antonyms: belief, faith
Origin
late 16th cent.: from French athéisme, from Greek atheos, from a- without + theos god.
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agnostic
agˈnɒstɪk/
noun
1.
a person who believes that nothing is known or can be known of the existence or nature of God.
synonyms: sceptic, doubter, questioner, doubting Thomas, challenger, scoffer, cynic; More
antonyms: believer, theist
adjective
adjective: agnostic
1.
relating to agnostics or agnosticism.
synonyms: sceptical, doubting, questioning, unsure, cynical, unbelieving, disbelieving, non-believing, faithless, irreligious; More
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theism
ˈθiːɪz(ə)m/Submit
noun
1.
belief in the existence of a god or gods, specifically of a creator who intervenes in the universe.
"there are many different forms of theism"
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Just type into google, Atheist definition.
Then you will realise, an atheist is merely not convinced. It is an antitheist that wants to tell another they are wrong. You can only tell someone they are wrong if you know what is right. Atheists don't know what the answer is, we humble in not knowing, we are (well some don't care) in the pursuit of that answer and we don't have a desire to fill in the gaps with dogma and superstition that we see no evidence backing it.