Certainly yes, but its not historic if it was done in their time is it? I mean Islam has been around for 1400 years, this could have been done ages ago when the church was relatively new - also I believe most of those churches were converted to mosques (Muslim prayer place) which would justify some re-configuration for their usage. This is taking into account that this was their land/property, anything else would be going out of line, exceptions could be made of course for how offensive something is.