It is irrelevant if there is a God or not that we will wake up to meet. If we are in nothing but a dream right now, so long as there is no way to tell otherwise, the dream itself is our foundation for all things and as such we must treat it that way, as reality. If we someday wake up, well, then the dream was nothing but a dream, and we're still in reality. (See previous post for logic concerning this). When you say:
Can't it be possible that life is a dream and when you wake up you are in the afterlife with your God?
This is meaningless, because for the duration that we are living the dream, the dream is the only reality, and for the duration when we wake up, we see that this afterlife is reality. Was it true that you were "in" a dream before? Well it might be. But if we have no way of knowing we're in a dream then it makes no difference at all and the dream is the reality.
However, this stuff about "waking up" from a dream is meaningless. If you "wake up" from a dream, then you see that your dream was just a dream after all and reality is unaffected. Either the entire sequence of all events that you can have knowledge of is a dream, and therefore also your reality by the prior logic posted, or it's just a dream and you'll wake up to your actual reality, in which case the dream was just a dream and everything isn't just a dream.
If God, if you believe in him or not, gave you a "life" to live in this dream, but you would eventually die in this dream and "wake up" to see your maker.
Then the dream is just a dream, and when you wake up you'll see reality.
If there isn't a God, you are left with whatever is true. That is why its called a possibility.
Well, "whatever is true" is going to be either you existed in your reality, or you existed in your reality, so, really kind of a redundant statement.
It sounds to me like all you want is to call "life" a dream and the "afterlife" reality, with death being some sort of "awakening." If that's how you want to define your terms that's fine, but that's not what I'm arguing against, and if that's all you want please tell me so that I can stop myself from looking like a fool for arguing against nothing.
None.