It is a way of life not a religion.
By Joe's definition of religion, it is certainly one, and in a way it's both, but if I had to choose between the two, I'd pick philosophy. Buddhism offers a worldview that constitutes, to my understanding, a system of thought.
Depends on your interpretation and practice - somewhat like Christianity (although Buddhism is more legit).
It a philosophy. A path to enlightenment. Not a religion
Let me paraphrase the budda, "I'm not God, don't pray to me for answers, meditate for enlightenment" if anything budda was an atheist and I might ad a dead beat dad who abandoned his family to selfishly satisfy his questioning. Homeless hippies are the real modern budist, budism is just listening to a hippies insights.