Instant_Cereal said:
Atheists can be religious or spiritual. There is no one, single definition for atheism and its flock.
Wrong. Atheism, by its very definition, indicates an absence of belief in deities. Thus, spiritualism wouldn't apply to an atheist either. You may not like the way the word atheist is defined, but that is the definition. Perhaps you were thinking of an agnostic person.
Here are the definitions of the relevant words. I'll let you be the judge as to whether atheism is a religion or not.
Religious
Main Entry: 1re·li·gious
Pronunciation: ri-'li-j&s
Function: adjective
Etymology: Middle English, from Old French religieus, from Latin religiosus, from religio
1 : relating to or manifesting faithful devotion to an acknowledged ultimate reality or deity
Spiritual
Main Entry: 1spir·i·tu·al
Pronunciation: 'spir-i-ch&-w&l, -i-ch&l, -ich-w&l
Function: adjective
Etymology: Middle English, from Middle French & Late Latin; Middle French spirituel, from Late Latin spiritualis, from Latin, of breathing, of wind, from spiritus
1 : of, relating to, consisting of, or affecting the spirit : INCORPOREAL <man's spiritual needs>
2 a : of or relating to sacred matters <spiritual songs> b : ecclesiastical rather than lay or temporal <spiritual authority> <lords spiritual>
3 : concerned with religious values
Atheism
Main Entry: athe·ism
Pronunciation: 'A-thE-"i-z&m
Function: noun
Etymology: Middle French athéisme, from athée atheist, from Greek atheos godless, from a- + theos god
1 archaic : UNGODLINESS, WICKEDNESS
2 a : a disbelief in the existence of deity b : the doctrine that there is no deity
Atheist
Main Entry: athe·ist
Pronunciation: 'A-thE-ist
Function: noun
: one who believes that there is no deity