Sure, but there's a seperation of church and state isn't there? The Bible should not be a deciding factor in what laws are placed.
(People should have the choice of doing wrong, without fear of the government interferring.)
Also, if it's between no parents, and a gay parent. would you really like to have a child miss out on a family, just because it's not totally God approved.
(being without parents isn't God approved either mind you)