You can talk about religion, race and sex in the game, as long as it is not offensive to anyone, you have nothing to worry about. In general its better to just leave those topics alone. As for freedom online? The internet is not bound to a nations standards or laws when it comes to freedom of speech or expression.
You have the freedom to enjoy the content of the game as long as you obey the terms of service which you agreed to before you ever even started playing and A game provider has the freedom to revoke your privilage to play if you break the terms of service.
As for quitting the game, game providers don't care. For every one person person who quits, another person joins. Wow is the same way, as is all games with a ToS. You can get banned in any game just as easily as another. So if you like the game, be conscious of your words and actions. No reason to punish yourself by not playing just because you can't do/say whatever you want.
Real life is exactly like online when offending someone with one key difference. Online you can get banned and in real life you can get hurt.
Oh and online you have more control over the situations you are involved in, in real life you don't always have that control.
PS: Game providers like Anet don't care if you're outraged, they already have your money.