Rob, you are not going to make accurate statements about atheism until you read up on and properly understand the differences in the various types.
As I and others have said, the onus of proof is always on the one making the positive assertion -- that something exists, that a book is true, that a theory is correct. There is no more onus on me to prove that the events in the bible didn't occur than there is onus on you to prove that the events in The Lord of the Rings didn't occur.
That's not going to change just because you don't like it.
There are no various types of atheism. Atheism IS the EXTREME: "God does not exist." This is a positive declaration, which requires proof, and there is as much of that as there is for the statement, "God exists".
Atheist (extreme: god doesn't exist, period)
Agnostic (everything in the middle from really really really improbable to really really really likely)
Theist (extreme: god exists, period)
The notion that you have strong atheists and weak atheists is ignoring the definition of atheist. We are not going to change the definition of a word to suit people who wish they were something they are not.
I find most people who describe themselves as atheists really have the following attitude: "I wish not to believe in god because I have witnessed absurdity (young-earth creationists, Pentecostal snake handlers), hypocrisy (sponsored war, lavish clergy), and evil (pedophilia, female repression) in religion; people who believe in god are clearly insane." Many such claim a background in scientific principles simply because they were educated in a liberal environment, so they often see religion as an impediment to scientific and cultural progress. They are not however, atheists. Not wishing to believe some is not the same as having a reason (evidence) not to believe. Those who think they have evidence against are only making the same blunder as those claiming evidence for.
At any rate, atheism always makes a positive assertion, and we're not going to change the definition of a word because you don't like it.