I would say that the entire idea of homeschooling is dangerous, unfair to children..
..and quite frankly, utterly retarded.
One of the big advantages of being forced to go to school is that all children get the same opportunities to "mentally deploy" themselves. Another big advantage is that they will learn what kind of behavior is socally acceptable (at least, in theory..)
Allowing parents to teach their children whatever they want is dangerous because I would think it is extremely easy to make an extremist out of your child when you're the only one influencing him. It is unfair to the child, because if your parents suck at teaching, you'll miss out on a lot of information, and probably won't be able (or willing) to get higher education. And I personally find that, in a certain nation, every child should get the exact same opportunities. So that some children are homeschooled by some YECs who never got an education, while other children are educated on fine schools with certified teachers, is in my opinion, a bit unfair for the child.
Ofcourse, standardized tests would remove a lot of these problems, but I still don't see why you would want to homeschool your kid, unless you wanted to brainwash him with some crazy ideas (crazy ideas that the kid might start to dislike if he actually came in contact with other people
)
Only legitimate reason I could think of is there not being a school nearby (or lots of trouble on the only school in the area, etc)
But meh, I get the idea most people don't homeschool for that reason.
Sooooo.. to awnser the OP
I think that homeschooling is stupid anyway, but if it is allowed, there should at least be standardized tests (including one about evolution ofcourse ^^), and the test should require some true knowlegde of evolution.
If the parents want to teach their kids both evolution and creationism, there is nothing that can stop them..
(well, you could ofcourse start executing people for teaching their children things that they believe are true.. but that's just a bit barbarian
)