And so you should be – you missed out the origins of the word 😀
Origin:
1200–50; ME a(g)heful, aueful; see awe, -ful; r. OE egefull dreadful
Quote : "see awe"
Awe – an overwhelming feeling of reverence, admiration, fear, etc., produced by that which is grand, sublime, extremely powerful, or the like: in awe of God; in awe of great political figures.
As far as whether Atheism is a "belief system", I guess it depends on your definition of "belief system". One definition of "belief system" is : faith based on a series of beliefs but not formalised into a religion; also, a fixed coherent set of beliefs prevalent in a community or society
I certainly know people who consider their Atheism to be part of their belief system.