What Nelson said!
I'd put my hand on The Bible and say "Fuck yeah! I'll tell the truth." Now that is REALLY swearing on a Bible.
If they use a bible, just add the classic "Federal endorsement of a deity or a religion violates the United States constitution" before you swear.
Why do they use the bible by the way? See above.
I think courts should use the "Pinky Swear". It seems to be legally binding as far as our kids are concerned and frankly I reckon it is every bit as reliable as some musty old book.
Judith vd R