There's actually a couple of questions here that have been addressed.
1. Can any belief be considered "religious" if the subject matter of that belief does not relate to a diety? Your responses here suggest that you adhere to this as the sole criterion for deciding whether a set of beliefs could be considered "religious." With respect to atheism, I simply noted that even if this were the sole meaning of "religion," atheism would qualify, because it pertains to a theistic belief (Eric went on to argue, wrongly, I think, that the word "atheism" entails no belief).
2. A second question was raised when I pasted a dictionary definition suggesting that a foundation of "ardor and faith," not the mere subject matter, provided the criteria for categorizin sumthin as "religious." Since you apparently have pre-conceptions to the contrary, you appear to have completely ignored this aspect of the question.