From what I understand about Catholic school, many are often ahead of public curriculum. It also seems a bit rigid and strict, but these are views from the outside.
Secular enlightenment and scientific progress needn't be opposed by the religious. One can easily believe in a deity and embrace the premise that said deity initiated the big bang and implemented the process of evolution and so on.
I believe that teaching of various religious traditions is not only permissible, but is a necessity. It helps dissolve tribal jingoism and better places one's own idiosyncratic cultural biases within a more coherent and broader perspective. I take the general position that more education is always the way to go. In my opinion the more one learns about all of religion the more one realizes that they are all simply the products of human imagination and construction.