Yes, I do believe in a life after death, and I agree with all of you who say that we cannot know what it is like.
However, it is only a belief, grounded in my personal religious convictions, so I may well be wrong - no one knows.
I think most of us have had experiences that could lead us to believe that there is some existence after death, but a lot of these experiences can be explained in other ways too. Mine certainly can.
I came home from abroad to visit my sister, for what I had good reason to think would be the last time, as she was dying of brain cancer. Arriving at the hospital, I needed a minute or two to collect myself before going to her ward, as my nieces had warned me that she wasn't always willing to admit that she did know she was dying.
Wanting to be alone, I went into the Ladies' and while washing my hands I distinctly felt my mother standing behind me. As she died 13 years before that day, and as she and my sister had never, after we grew up been on the best of terms, I was considerably surprised.
Obviously this could well just have been my imagination, or my need to have mummy to make everything all right - although I knew full well she could not do so, but I chose to understand it as a sign that my sister would not have to go out of the world on her own. Although I still feel my sister would probably have wanted Daddy rather than Mummy as her escort!
On the night before our father died, my sister woke at four in the morning to see our grandfather standing at the end of her bed - he had died when she was 10. She was puzzled why he had "come" to her - I could only think he perhaps felt the need to drop in on his way to collect his son.
Again, it could just be imagination, but does it really matter whether it was or was a "real experience" if it consoles us at a difficult time?