Any other constructive advice? (I don't really believe in voices from above telling me what to do… ;-) )
I've heard of parents who weren't happy about the situation either, but again no one seems to dare bring it up "officially". If the school isn't following its mission statement, surely something can be done to at least discuss it (without compromising my career)?

I work in a international school in Europe and its "mission statement" is filled with promises of respect for all, etc. but over the years there's been a clear shift: fellow teachers are including religious viewpoints in their lessons, many of the charities the school supports have religious background and every Sunday, the school is even used by a Christian church for service, Sunday school, etc. Several of the workshops offered to teachers are also organized by religious-related organisations.
I don't support any of this and it clashes with my view of what an International school should be (i.e. void of religion).
I've been working in the school for several years and have been happy here, but I do not like the direction it's continuing to take. Which official instance can I go to? Voicing my concerns within the school would not change anything (and make my life hell afterwards…). The director would not do a thing (the board & PTO are both headed by individuals who 'abide in God', and the core of "rich and influential" parents is also very "holy"…).
Any suggestion very welcome. Thanks!