Your comparison between crosses and minarets is totally erroneous. I support the right of Christian churches to have crosses on their own property. I see no reason why they need to put crosses on public property. (That goes for us and menorahs, too.) In this case, the minarets are not on public property. While every civilized society maintains the right to impose some limits what people do on their own property (zoning is an example) we must oppose those limits if they are based on a religious test, if for no other reason than we will likely be the next targets of such discriminatory rules.