Can we talk about an atheist regime?

So if we take God out of the picture, they will probably have to rely on personal conscience instead - rather than interpretation of rules created for people far removed by culture, time period and circumstances from our own.

You can never remove God from the picture, the only thing you can do is replace him with false idols. Humanity requires God to exist even if it is possible he does not.

While Big Bang doesn't answer all the questions, the questions it does answer have far more evidence behind them than a text such as the Bible.

Why? Because the math looks good? Just because something is possible doesn't mean it is the only originator.

The letter J is only 8 centuries old, seems to have stood the test of time rather well as a linguistic invention.

True but the evolution of language has never relied on writing, I doubt that for the vast majority of those 8 centuries the common man knew what a J was, as well as cultures that didn't use the letter J but still used it's sounds.

I don't see atheism as necessarily contemptuous, anymore than I see religions as necessarily oppressive to other faiths. For me an atheist government would delegate the costs of supporting religious activities to the congregations themselves, rather than picking up the tab as secular governments do today with tax breaks and waiving other financial obligations.

But now we are quibbling terminology. To me that would be the definition of secularism.