You lie in stating you are "amused." You are angry at the slightest suggestion you may be morally inferior to anyone but yourself. The grave is not an "implied" threat. Ask Adam. Ask anyone. Or do you have a doctor who with the answer to all birth defects?
The "grave" is certain, but you imply that I am destined for eternal punishment. Lets not mince words.
I am not claiming superior morality. I am just interested in why people think bearing false witness under oath is a good way to serve their religion.