Eternity is here and now. If it were not, it would not be eternity. You say that you are saved, but elsewhere you also say that you will be sure of that only on the "other side of the grave." How can you then witness and testify to something you know only from a book or other people's talk? That's like a testimony of a rumor -- any court would laugh you out. All in all, if you posit eternity that has a starting point, it cannot be eternity by the very definition. I'm sure I don't have to explain the implications to you.