You are correct, atheists and those of non-Islamic faiths are not allowed the use of public space in many nations that are Muslim majority - so what? Is that what you want in America, only Christian displays on publicly-owned property? There are no laws in this country, or shouldn't be anyway, that prevent religious displays on private property accessible to public view. There is no attempt to stop people from putting up Nativity displays or menorahs or statues of Ba'al or Baphomet or a simple wooden post on private property.
Curious to see how many know the "simple wooden post" reference