Aside from the rich man and Lazarus account you claim to have never seen, there is another - Jesus Christ Himself. Many, many people saw him after the resurrection. He did tell of the wonderful place from which He came.
He was either a fraud, a lunatic, or the Son of God. He either knew He was lying, believed His lie, or was telling the truth. The absolute truth, by the way. The men following him were willing to DIE rather than renounce Him. They knew He was the real deal. They had seen Him die - and they saw Him after He rose. AND HE SAID HE WAS THE ONLY WAY.
If you are brave enough, I have a book I will send you. If you are open minded enough, send me by private reply your mailing address and I will send it immediately. It makes the case much better than I can. Do you dare?
I'd heard of the Lazarus tale, just not the parable. The problem is that to me these are untrustworthy accounts. Even the accounts of the resurrection differ. In any case, other religions can offer the same "miracles," so Christianity is not special in this case.
Send the book, but it must make a logical case within itself without appeal to the absolute authority of the Bible (I believe it to be highly embellished history).