We have been using Bible Road Trip. It's basically a Bible survey students complete over the course of 3 years. Students work book-by-book, using their Bibles and Bible handbooks. They also learn about needs around the world and how they might pray. It can be downloaded for free. It's designed to be used with students of multiple ages, so everyone studies the same thing, but at different levels of depth. I didn't see any explicit teaching on creationism or evolution. I'd love to hear what you end up using!