I just read a great article about secular or non-religious homeschooling. The idea is that there is an underserved community of people who do no want their schooling to come mixed in with their religion. There are now full communities of secular homeschoolers.
While not godless or even necessarily people not of faith, they (we) just prefer to have our children educated in two ways. One is the secular standards based education that our country has defined. the other is the religious, ethical, and spiritual beliefs of our family and chosen community.