Since Julian had to type his advice, here is mine. History gives us facts that people existed, there are also landmarks that tell us what history happened there. You can choose to believe or not while on living on Earth, God gave us free will. I believe and love God and nothing/no one will ever change my mind. I know He exists. I love the fact that there is Heaven and Hell and Heaven would not be Heaven unless it was perfect, everything works out in Heaven.
Have you heard of Purgatory? This is where souls suffer and are cleansed before entering Heaven. I like the concept of it. If you figure we have to be cleansed of our sins before entering Heaven but long to be in Heaven, it may be somewhat akin to Hell although it isn't quite Hell and we are not damned for eternity.