Educational establishments should not have any ideology, religious or anti-religious.
Ideologies are notoriously difficult to avoid. The British Humanist Association know this full well when they laud non demoninational schools for being close to what the BHA espouse. That sounds neutral until you remember that secular humanism is an ideology.
I tend to focus on foundation. There are times when there has been no social compunction to found schools and the motivation has come from religious institutions.