Addition: Atheists can sound pedantic when it comes to word order, but this pedantry has a point. Compare the following two sentences:
"I'm asking you to not join the Navy."
"I'm not asking you to join the Navy."
The difference in word order is the same as the different phrasings between different atheists:
"I do not believe god exists." (I call this atheism)
"I believe god does not exist." (I call this strong atheism)