What is the philosophical difference between being an atheist an being ...

too deep for me to understand your topic, not to say discuss it.. :S

hmm well im not sure

An atheist beleives that god does not exit. On the other hand a non-religious person beleives in god but is not ritualistic.

An atheist doesn't believe in God (or a god, I guess). Someone who is nonreligous (however you define that) may just not choose to practice religion. A 'nonreligous' person may also be an agnostic, someone who believes that the existent of God or some other higher power cannot be proven or disproven. This is how I understand it all, anyway.

Being an atheist means you do not belive in heaven or hell. Being non-religious just means you are not religious. The main differences is that one in being an atheist you do not belive that god exists. Just being non-regligious you are not sure if god exists or not.

A atheist is someone who doesn't believe anything about any religion at all.And also a lot of them seem to hate christians.A non-christian doesnt argue about if something is right about god or whatever(most the time) and they are pretty nice.Also I've seen and heard a few atheists in my days and they dont seem to have as many morals as the non-christians.

i don't know but I'll take a wild guess: the atheist believes in nothing while the non-religious has nothing to to with religion but believes in something his own(could be a witch, or something)