Yeah it's definitely a problem in absolute terms, but what I was getting at is whether it's comparatively a problem; otherwise we can't pin the cause down on a certain factor. It could instead be an issue of development. It's not the exact same thing, but plenty of Muslim countries have low literacy gender gaps, and predictably this is more present in wealthier countries rather than more secular countries. In general it's better to look for structural explanations to these things rather than blaming culture or religion.