Thank you for a most intriguing question. But it's also funny.
It's kind of like a blind person asking if colors are real, or if they are merely figments of people's imagination.
When you know that you are not your Homo sapiens body, and when you have remembered thousands of prior lifetimes, and performed miracles dozens of times, then it's easy to say -- I don't think there's life after death; I know there's life after death.
And I know that there is life after life. If you awaken as a spiritual being, then you will have everlasting life, because you will no longer be dependent upon this Homo sapiens body for continuity of consciousness. You will be able to hold continuity of consciousness in your own spiritual mind