I like this post, today's installment from Our Daily Bread. Believers in Jesus Christ do have hope beyond the grave. So, we can take a different view of life and death.
But, not to be picky toward the grandfather mentioned in the Our Daily Bread piece, "Goodbye" is actually an old English contraction for the phrase, "God bless you [ye]."
I try always to make a point of always saying, "God bless" when I end a phone call or a visit. That isn't a final greeting, it's a prayer for continuing blessings.
By the way, here's a link to the great passage on which the Our Daily Bread post is based.