I really don't understand what some people (atheists) have against a peaceful prayer. Why do they try to stop it?<quoted text>
That's incorrect. In fact, there was a recent instance in the news of an atheist student who complained about prayer-led football games at her high-school, and they had to stop. Naturally Christ-like death-threats ensued (to be fair, only from a few nitwits). If someone complained about the led-prayers at city hall, they'd stop.
You do have freedom of religion, you don't have the freedom to foist your religion on others via the government, which is what happens when city hall starts with a public prayer. Personally I myself would probably not complain as it would be too much time/trouble, which is evidently how all the other non-Christians feel at your city hall.
It's not like if they hear an actual prayer they're gonna magically turn Christian.
Usually those kind of public prayers, outside of church, simply ask for guidance & wisdom.
What's the big deal?