According to the evidence I have observed, first hand, and from people I personally know and trust, we have always existed and will continue to exist.
“Afterlife” is a misnomer, as is “pre-existence”. They both beg the question. If life and existence always IS, there is no such thing as a “before” or an “after”. So, in that respect, I don’t believe in an afterlife, or a pre-existence, either. And, I don’t believe in “fairy stories”, either.
For me, it’s not a belief, and I cannot present evidence to others if they have not, cannot, or will not observe the evidence for themselves.
But, I can point out a couple of things that could point in that direction.
(1) On the TV show Brain Games, a bunch of children are busily skipping rope and doing some very incredible maneuvers. The announcer tells us that in the background, unobserved by most, a man comes on the scene wearing a chicken costume. He promptly leaves. Some people saw him. Some didn’t. We could argue all day and even get religious about whether or not there was a man in a chicken costume.
The question is one of attention and observation. If we are so focused on grubbing our way through the things of material world, we may not spare a little attention to focus on what’s BETWEEN those things, and though we might assume that there is nothing in that empty space we might assume that if we didn’t see it, it doesn’t exist. But, that’s not really scientific. We can’t see germs, but they exist.
(2) We have all heard about ultrasound. I read just last week that ultrasound can stimulate the brains of mice and reverse the effects of Alzheimers disease. Who would have believed 100 years ago that a vibration that we can’t even sense could have a physical affect on the brain. What if there were even higher vibrations, so high we cannot detect or measure that also have an affect on the human brain, perhaps causing the mind to perceive people and things of an even high vibration, which we cannot measure or detect with present technology.
I offer these two points, not as proof, but as possibilities.