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Have you tried the sample units from TOG? I would suggest that you Check out the books from the library, print out the samples and examine it closely. I have heard many times that it would be difficult if not impossible to use it in a secular manner but I just loved that the it was multi-level and had all of the background information for the teacher all nicely in there for me with books for the kids scheduled along with discussion and accountability and writing assignments and crafts.
I ordered unit 1 of year 2 for next year and couldn't be more pleased. I have chosen to skip some of the books, but there are alternates suggested for just about everything. The rhetoric level has much more comparison to the Bible for each topic than the lower levels do. I am now looking forward to using TOG for many years to come. The first year looks like it would be much more difficult to adapt, but there are many parts of at least three of the four units that could be used in a secular way. For me, the benefits and the richness outweigh the trouble of filtering.
My TOG unit is now in binders, and page protectors with notes and tabs and lists. I have read it completely through once already and I just got it this week. I love it. I am thinking of starting it in April or May so that my kids can be most of the way finished with it by the time the Ren. Festival starts this summer.