One of the themes I think about every now and again is that of the nature of belief, the purpose of religion, and the presense of truth.
Specifically, do the differences between spiritual beliefs really matter? Meaning that, if every religion is just an amalgamation of different combinations of mysticisms, does it really matter if we are Protestants, Catholics, Quakers, Mormons, Muslims, Pagans, Jews, or even Jehovah's Witnesses? Further, does it really matter whether we believe in God or not? Do we need to fully believe in God to avail ourselves of one (or more) of the world's religious heritages? If not, why wouldn't atheists and agnostics associate themselves with a particular religion that they find acceptable? Many religions don't even require belief in specific doctrines, but encourage a self-motivated adherence to a life-pattern, leading to a more individualized faith of unique expressions.
I guess what I'm getting at is what's involved when people just decide to believe certain things, and under which circumstances they are able to rationalize doing so. For example, since I don't know if God exists, does it really matter whether I think he does or not? If not (if it doesn't matter to me or the rest of the universe) then why wouldn't I just choose to believe in the God I constructed for myself (or even the God shown to me by a packaged dogma or spiritual way)?
If I chose to believe in God, my life might very well be better, since it could remove many existential stresses placed upon people who believe there is no conscious order to the universe or higher state of consciousness (spirituality) that transcends time, being, and self.
Anyway, I'm just rambling I guess, and wanted to get some thoughts down.