Luckily, instead of BC (forget what this one is) and Anno Domini , there are BCE (Before Common Era) and CE (Common Era). They're the same years, like 1 BC is the same year as 1 BCE, so it still revolves around Christ, but at least the names are secular. It'd be really confusing if we changed the point the years ran down to.
For the second one, it is politically incorrect not only because of the separation of church and state, but because monotheism is not the only one. There is polytheism and ATHEISM, which is what the gov should naturally be; without religious influence at all. They only added them during our paranoia in the Cold War. The "Under God" in the pledge, too. It'd be nice to see them removed. But it's not a huge concern for me what's printed on our currency so long as it doesn't hold true in government practice.