Still, I would recommend against giving the government such private information. There is no legitimate reason they would need that -- unless they want to know who to come arrest first (for homeschooling, having more than 2 kids, being Catholic, etc.)
I wouldn't trust the government to keep it nice and private. After 9/11, that kind of trust is, sadly, too much to ask.
If the government can allow/cause the deaths of 3,000 people so that we can go to war and cause the deaths of tens of thousands of Iraqis, as well as 2,000 of our own soldiers -- just so we can have bases in Iraq from which to bully the rest of the Middle East -- I'm sure the government has it within them to not keep my private information private.
Matthew