Ziggy Stardust
Absolutely Sane
http://oxforddictionaries.com/definition/disbelief
Pronunciation:/dɪsbɪˈliːf/
noun
[mass noun]
inability or refusal to accept that something is true or real
lack of faith:

edit:
http://www.thefreedictionary.com/atheism (your source)
Noun 1. atheism - the doctrine or belief that there is no God
godlessness
religious orientation - an attitude toward religion or religious practices
theism - the doctrine or belief in the existence of a God or gods
2. atheism - a lack of belief in the existence of God or gods
unbelief, disbelief - a rejection of belief
By the way, I don't think how interesting a word (or definition for one) is is a valid ground to dismiss that definition.
Pronunciation:/dɪsbɪˈliːf/
noun
[mass noun]
inability or refusal to accept that something is true or real
lack of faith:

edit:
http://www.thefreedictionary.com/atheism (your source)
Noun 1. atheism - the doctrine or belief that there is no God
godlessness
religious orientation - an attitude toward religion or religious practices
theism - the doctrine or belief in the existence of a God or gods
2. atheism - a lack of belief in the existence of God or gods
unbelief, disbelief - a rejection of belief
By the way, I don't think how interesting a word (or definition for one) is is a valid ground to dismiss that definition.