Definition of Atheism/Atheist with no catches.

# Atheism is commonly defined as the position that there are no deities. It can also mean the rejection of belief in the existence of deities. A broader definition is simply the absence of belief that any deities exist.
# someone who denies the existence of god
# related to or characterized by or given to atheism; "atheist leanings"

Concerning my point that saying that Atheists come to their belief or lack of it by thought and reason is a dogma.

Plenty of people of faith think about the big questions and have used reason to choose it. Perhaps Jon is one of them. I know I am, I think about and re-evaluate what I believe constantly. Plenty of Atheists are Atheists because they were raised into it or because some aspect of or person in their former faith invoked fear or anger in them.