This is a video game forum. Most of us here don't even have a life before death.
This.
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Let’s say we had access to immortality. And you have a choice to become immortal or not to go to an afterlife. Would you do it? How do you know for certainty there is life after death? Because if there isn’t then you made a big mistake. And you can’t experience life anymore. You cease to exist.
Death does not give life meaning. Life gives life meaning. Forming bonds, relationships, experiencing music and all of life’s stuff. You can’t do this if your dead and there is no after life. If you had family and friends that chose to be immortal. Would you choose to be immortal too? To be with them here on earth. Or is it against your religion to seek immortality? Because you are playing God.
What if you had children that don’t believe in the same religion you do and choose immortality on earth. Will this affect your decision?
I'll answer these one by one.
"Would you do it?"
Depends, if there's something I've left to do I'll take it.
"How do you know for certainty there is life after death?"
Because of what I know about God, I'd rather not turn this into an argument about God's existence though, especially because of the many different faiths out there, it'll just get messy.
"Because if there isn’t then you made a big mistake. And you can’t experience life anymore. You cease to exist."
No I didn't, because I can still enjoy life and believe in an afterlife you know. They're not binary options.
"Death does not give life meaning. "
I'd say it does, by knowing you have limited time here it drives you to be the person you want to be, live those experiences you want to live. Being immortal would be a boring life in comparison, you'd complete everything you wanted to do and then some, but then what? You wait until the universe's eventual heat death bored out of your mind.
"Or is it against your religion to seek immortality? Because you are playing God."
I don't think it's against my religion (I'm Muslim, by the way) to seek immortality, simply for the fact that I view God as the creator of the universe and everything in it. The only way we can play God is to create a universe, which as far as I am aware is impossible.
"Will this affect your decision?"
Nope. Whether or not I choose to continue on living will be based on what I want, not what others around me want.