We shouldn't exclude the myths of the Old Testament in our education system. They should, however, be taught as myths alongside Greek, Roman, Norse, Native American, Australian Aboriginal and so on.
Rudolf Steiner schools teach this way (though they do claim to be a bit more Christian, unfortunately), but it gives the children a broad education, which is vital.
Most creation myths are almost identical across these civilizations- see the wonderful Joseph Campbell books on Primitive Mythology.
Addit- you can choose for your child to attend religious education classes at public schools here, or else they do something else.
I still think it's important for children to be aware of the Bible even if you're an atheist, like myself, which is why I like the idea of it being taught alongside other ancient myths and legends. By excluding it altogether, you are giving the Bible a 'taboo' status, and you know where that may lead...