I didn't say there was any evidence specifically for the big bang, but you have to remember that any theories you come up with have to match observations. For instance, the expanding universe needs to be explained.
Anyway, Andir does raise interesting points. Britain is more liberal than America, and less religious, and yet, if you look at the national anthem:
God save our gracious Queen
As I stood up to sing it recently, I realised I couldn't. But then, to hold public office in Britain, you also have to pledge allegiance to God and the Queen. Then there's the Church of England, an official state church, and one which spends almost all its time on a polemic against gays, emancipated women and atheists (and why they are causing society to collapse). Why the hell should these people be allowed to rail against us like this? Why the hell do 26 of their bishops automatically get a place in the British version of the supreme court? Is this not a gross violation of the pledge to seperate church and state if 26 of them (a fairly significant number in a 740 seat house) automatically get a place in the second most important house of representatives in the country?
In addition, many of these bishops seem to feel qualified to tell us why our country has problems (or perceived problems). It's all down to the emancipation of women, the collapse of the family. They claim to be inclusive, and yet many of their members still refuse to aknowledge women in the clergy, and a significant minority (at best) refuse to allow homosexuals to marry (not even in their own church, but in other churches as well).
Anyway, when all of these things have been rectified, when the Church of England and all other religious institutions have no say in the politics of the country, maybe then we can say that religion is just a harmless personal choice. Until then...