I don't believe in an afterlife. I do think it is scientifically possible, however, that we could exist as energy post-death in some other form but I don't know if that form would allow consciousness as we think of it. It's also possible, using the "we are in a holodeck" theory, that perhaps when we die we actually go back to reality and exit this simulation... in which case, there would be consciousness. There's also a possibility of reincarnation and there may or may not be any kind of remembering of this lifetime.
However you slice it, I'm hoping I'm right and it is just nothing. Granted, that is a tough concept for anyone to grasp. I mean, for as long as you are aware you have been alive. We know that there was life and existence of others before we were born and have memories. That is easily proven with our parents being older than us and then seeing how we age and become adults like they were. So, we know conceptually that there was existence before we remember being here.
But, when we go to sleep or are knocked out for surgery, we always wake up again later. It's like time-travel where we jump instantly from one moment to the next hours later, but we do come back to consciousness. It's tough to imagine going to sleep and having no dreams and never waking up again. It's hard to wrap understanding around that. You literally can't know until it happens to you.
I do hope for nothing though... no heaven or other afterlife no reincarnation or leaving-the-simulation... just nothing and no awareness. I hope my awareness just ceases at the moment of death and that's it.