While we are banned to do it...

How I wish non-Muslims can freely do this in Islamic States as they freely enjoy doing it in our democratic cities.

NYPost

Miami New Times Blog

Or perhaps one Muslim would stand up and use his/her democratic rights to pressure Islamic States allowing Christians to put up their ads in buses and in main streets calling them to consider reading the Bible. That is but fair enough...

Would anyone dare?

Lastly, Mr. Robert Spencer carefully evaluated what's the difference between our sense of dialogue to non-Christians in Christian dominated states such as the United States of America:

In the United States, for example, Muslim minorities have the exact same rights — to build places of worship (mosques), publicly carry their scriptures (Korans), to worship and proselytize, and, simply, to be Muslim — as do Christians, Jews, and the rest. That is proof that the West is prepared for dialogue over ancillary matters: it has already visibly demonstrated that it firmly believes all humans are guaranteed basic rights.

Countries like Saudi Arabia evince no respect for basic human rights and freedoms. The contrast is amply demonstrated by the recent comments of one high ranking Saudi who said that “It would be possible to launch official negotiations to construct a church [note the singular] in Saudi Arabia only after the Pope and all the Christian churches recognize the prophet Muhammad” — which of course would make all Christians Muslim. (read here for more)