Atheism is also technically a "religion"... I was thinking primarily along the lines of that first definition and the second (which doesn't really apply to Buddhism very well, as it is practically the same as the first, just an officially organized Version). The "spiritual philosophy" to which I refered would be along the lines of 3 and 4, without 1 or 2. Buddhism is about attaining enlightenment through perfection of the mind and such, which doesn't fit the typical concept of "religion" very well.
According to number 4, playing SE4 is a religion.
