Acts 27:25 (This is the apostle Paul expressing complete faith in what God had communicated to him. In this case, he is speaking with respect to the safe passage of a ship and those on it. How much more we can say these words regarding what God has told us about life after death.
If you have the time, perhaps you would want to read the book The Biblical Case for Everyone Going to Heaven.
If you are familiar with the Bible, or want to hear more from it, you may want to read the companion blog: A Bible Reader’s Guide to Jesus and His Kingdom.