And the answers are, according to the National Safety Council[i]
#1 = basketball,
690,000 ER visits per year
#2 = bicycling,
#3 = beds: 400,000
#4 = chairs &
#5 = carpets &
So the bad news is: yes, your bike is probably more dangerous than your house if you live in a house with no carpets or furniture. But if your house has a carpet and furniture, watch out! And we won't even talk about stairs and floors, which cause over 2 million ER visits per year.
The serious lesson here is this: America is a big country. All numbers are big. Yes, bicycling's 590,000 ER visits per year sounds like a lot - but if beds cause almost as many injuries as bikes, can we really say bikes are dangerous?
[i]. National Safety Council, Accident Facts, 1997 Edition