Belief in an afterlife does not equal a belief in God. Buddhists can believe in Gods, but Buddhism is not God-centric.
I do not necessarily disbelieve in existence after death. I simply accept that there is no proof of continued existence or interaction with the physical Universe after death.
You do realize, of course, that nihilism is also a philosophical stance.
We exist because we exist. What we do with that existence, as I've said, is up to us.
What one American does, a continent away, has little effect on one Bangladeshi. One Bangladeshi, however, can have a big effect on other Bangladeshis.
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Am I certain that I can influence the world? Yes, yes I am. Right now I'm influencing you. I'm also influencing a few dozen people possibly curious enough to read this post. I'm also influencing dozens of people who might read what I write on Facebook, hundreds who read what I write for work at my office, thousands who read what I write for work at the magazine, and tens of thousands who read what I write for the web.
Beyond that, though, I exert influence on my neighbors. On the woman who I buy my diet sodas from in the morning. On the janitors, co-workers and students I greet every day.
Just because there are a lot of people in the world doesn't mean individuals are worthless. In our daily lives, we still interact on a local level, and that's important.
Self-satisfaction and self-fulfillment. Sounds like very little, but in the end, that's what everything boils down to, whether you believe in God or not. And beyond that, satisfaction that you've furthered the cause of humanity.
Already answered. Because human life has value.
Let's play a game.
Do the lives of other humans have value?
Answer: No: Bam. You're dead. If you don't value other people's lives, there's no reason for us to value yours. No need to talk to you any further.
Answer: Yes. Cool. Now don't kill/rape/oppress us, and we'll return the favor.
Simple philosophical reciprocity. Mutual respect.
To go further down that avenue, perhaps you should read
@Danoff 's Human Rights thread:
https://www.gtplanet.net/forum/threads/human-rights.77925/
As an example of creating an entire ethical system from just that single premise.
Have fun, then.
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It's interesting to note that in educational/developmental terms, there is the transition all children must go through where control moves from the external to the internal. Where discipline, routine and ethical values are no longer enforced by a teacher or parent, but are instead internalized, requiring no punishment-reward system to ensure compliance.
Ergo, adults shouldn't need to be paddled to ensure good behaviour.
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Which brings up the question, again:
Without God, would you say that you have no internal control over your actions?
That you would act nihilistically, and without thought as to the consequences of what you do?
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This is where the Christian religion, arguably, moves forward from the fire-and-brimstone of the Hebraic (Old Testament) religion that preceded it. In that one, control was completely external. "Do this or be punished."
Christianity has a more simple, and a more abstract rule: "Do unto others..." one that does not prescribe a certain set of actions, but which asks its followers to think about which actions are appropriate.
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Humanism simply goes further and says that we should not love each other because God says so. We should love each other because it is simply the right thing to do.
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Also, your fascination with death is telling.
Just because a book ends, doesn't mean there's no reason to read it. (I'm assuming you read books for fun).