I had noticed an ad for that too, and went to their website to check out their FAQ. I love this part (in response to whether Christian references are included in the curriculum):
We assume that Christian parents already make Bible study an integral and essential part of the child’s daily schedule. We believe that science, for Christians, is simply observing and truthfully describing God’s creation. Our books are carefully selected to provide marvelous examples of all of the wonders of His creation. Our curriculum is written to provide a framework for an organized study of science, not as a tool to provide our own commentary. If science is viewed from a Christian perspective, then His invisible qualities will be clearly seen (Romans 1:20) without any need for comments from us.
We have also chosen not to include Scriptural references in our materials outside of the introductions. Many science programs are being marketed as Christian homeschool science because they have sprinkled in a Bible verse here and there. Some of these programs use verses that are clearly taken out of context. In our opinion, it is unacceptable to teach children to mold Scripture to fit our needs rather than allowing it to teach us in context. We instead recommend that a complete, sound Bible study be used in conjunction with our curriculum (or any other).
At another point, they address evolution “and other secular ideas,” and say that they don’t tend to include commentary on these kinds of issues, or dogmatic presentations, but do bring the topics up because kids need to hear about them.
In spite of the fact that evolution is referred to as a “secular idea” (I mean, I guess it is, but no more than other scientific ideas), I would certainly be much more open to a curriculum that holds these kinds of views than most other Christian science textbooks I’ve seen. Maybe I’ll keep them in mind for later on.