I let everyone to decide what is true, false, good or bad. I would keep my truths near to reality.
Afterlife is something we know nothing about. It may be real, it may be a fairy tale, I don't know. At the same time we know nothing about something that is related to both afterlife and reality to form at least a subtle connection between the two. When something has so zero or nearly zero relationship with reality then believing anything is really pointless in my opinion.
IMO, reality does figure into it. Part of my reality (and yours is similar, I'll bet) is that I'm a conscious being. I think, I dream, I feel, I experience things, I gather knowledge through senses and intuition. Being conscious and doing all those things is what comprises my reality. It's what I might call being alive.
Now, part of what I'm conscious of is that my physical body will someday die. I don't know that with any more certainty than I know anything else, but it appears to be common knowledge, and I accept it. I've seen corpses, and that counts as evidence for me. Anyhow, I'm sure you'll agree that human bodies cease to function at some point.
What I don't know, one way or the other, is whether I will continue to function as a conscious being after my physical body dies. It's difficult for me to even imagine that consciousness would ever end. Even when I go to sleep at night, I dream, and there's consciousness in that too. If I'm sedated for some medical procedure, I may later have no memory of what happened, but that doesn't mean I wasn't conscious of it, in some way, at the time.
So, as I go through life, I'm always conscious. When I go to sleep at night, my consciousness shifts, but it doesn't cease. When my body dies, am I certain that consciousness will then cease? No--not at all. It might very well continue. I may go on being aware--thinking, feeling, dreaming, experiencing things--as a disembodied entity (what some religions call the Soul).
For me, there's no wild imagining beyond reality involved. In my reality I am Soul right here and now; I am a Soul incarnated in a physical body. As Soul, I am conscious--I see and hear and experience things. When I'm awake, I do that mostly through my physical body, but when I'm asleep I may be doing it apart from my body. It's conceivable that I might learn to consciously leave my body while alive; and it's certain that I'll leave it when the body dies.
Have I lost you somewhere? If so, it's because you believe you
are your body. That's not a certainty, nor an irrefutable bit of reality; it's just your belief--and a false one, IMO.
Yet, you experience presumably the same consciousness as I do--you dream and feel and think and see and hear and experience all kinds of things. The only question is whether that will continue after our bodies cease to function. I believe it will, because I believe my body is just something I
have, not something I
am.
Each of us has a choice--to identify with our consciousness or to identify with our body. Both consciousness and body are aspects of reality. So, even if we stick to dealing only with reality, we still have to address the question of how closely and permanently connected body and consciousness are.
Thus, "belief in an afterlife" really just means believing that individual consciousness does not cease when the body dies.