the only place we can all co-exist is in the hands of a modern liberal secular democracy.
what strikes me as odd about very religious people -- of all faiths -- is that they don't understand that it is secularism that allows for the robust practice of any faith to begin with. christianism - politicized Christianity ... i'm trying to find new words so i don't piss off all self-identified Christians - argues for the imposition of one religion's values over the entire society. the example that leaps to mind would be preventing gay couples from getting civil marriages or unions and prevent pregnant women from seeking an abortion. secularism, by contrast, does not say "marraige for gay people and federally funded abortions." what secularism does is allow Christians, and any other religious faith, to affirm religious values, live exactly as they see fit, and avoid abortion and gay civil unions in their own lives. secularism says that, because the government represents all citizens equally, it must be as neutral as possible in regards to theological issues. the Church and the state shall coexist independently.
this does not mean that all displays of faith should be removed from the public arena. secularists can be immoderate too. however, it's hilarious when fundamentalists to say that they are being persecuted merely because others are treated equally in the public square. i.e., it's ludicrous for Rick Santorum to say that gay marriage is an attack on his marriage.
and the irony of this is that secularism is not only compatible with aggressive and proud Christian faith, secularism actually allows the practice of that faith in as free a form as those who live in a secular society might wish. secularism does not regard the rights of minorities as somehow only achievable at someone else's expense -- and if Christianists were in the minority, they might come to value secularism in the ways that Jews, Hindus, Muslims, and atheists currently do.
essentially, the difference between secularism and Christianism is that one side is happy to let people make their own moral choices; and one side isn't.