When you die you're dead and nothing happens.
How do you know? You haven't tried it before.
Personally, I share the opinion of TheGreenSadler. I agree that our spirit leaves our body, but I'm not exactly sure what happens after that.
Get into coma for some days and wake up. Then try to remember what happened to you during that period.
When we die our brain simply switches off, forever.
Exactly. I agree with you. I believe death is a full blackout. Much like sleeping but not having a dream.. and never waking up. I probably won't ever be convinced of our spirit remaining alive and going to heaven.
You eventually wake up from coma, death is eternal. So basically you die and then nothing for the rest of eternity. How would you even know that you're dead?