As a religious freedom supporting atheist, I'm constantly annoyed at the failure of religious people to understand that doing things like teaching religion in schools or having
school officials lead prayers are, in practice, more like to genuinely offend them than me. I know we're in this ecumenical Christian "don't talk about any actual theological or doctrinal differences" world, but the fact is different Christians believe different stuff, like different prayers, and have different traditions and practices, even within relatively homogeneous communities.