Seems like you are using books as they are intended. You do not need to be orthodox to the idea that is represented by such books just be inspired by them. This

Seems like you are using books as they are intended. You do not need to be orthodox to the idea that is represented by such books just be inspired by them. This is especially true for maths, but also books like the Bible were you can not read the book and then know Christianity, you need the principles .