im not sure what would happen, but im sure by the end of obamas first term, we will all be able to answer this question.
It can damage your voice.
there will be tyranny
Nothing or no one "allows" people to choose their leaders and voice their opinions. People just do. Even in a tyrannical government that disregards the basic rights of the people, the people through a willingness to suffer these abuses have chosen their leader or leaders. Even in a democratic society people tend less to "choose" their leaders and tend to follow the leader. Even in a government that insist that the people have no right of choice, have no right to defend themselves and have no right to freely express themselves people will voice their opinions. Some will even choose to not follow that or those leaders and will defend themselves vigorously against these tyrants. What or who allowed you to ask this question? Of course, there are obvious technical answers to that such as a computer, the internet and wikianswers allowed this, but even without all of that, would you still have asked the question? Who allows you to ask questions? Who allows me or anyone else to answer? The government? How do they allow this? You are allowed to think what you will, even if that thought is that you must be allowed to think that thought, but I assure you, if you actually thought that thought it was you and you alone who allowed it.
The Nazi Party of Germany allowed the Holocaust to happen so the German people would be unified against the Jewish people.
the planet would be a fun place
There would be issues with forming your own ideas in this system. There would be no opinions allowed and everyone would need to think the same for it to work.
free elections
then that wouldn't be allowed cause they are both gods
no one would want to live there except the people with the allowed religion
There is no law prohibiting it. However, it would never happen.
many wavelengths do pass through the atmosphere.
First of all, girls are allowed in the Olympics ,as athletes and as a part of the crowd. This was allowed since the Modern Olympics started (1896-present).In the ancient Greek Olympics girls would not be allowed to do anything with the. She would thrown out.To answer your Question (answer): Nothing