None of the examples you provided involved an organized group of Christians trying to impose Christian dogma on society. You are correct that it does involve individuals using the political process.
Also, most of those examples are not religious based. And even the one that arguably is (intelligent design) has advocates who are not Christian.
Using the political process to lobby and/or vote is part of the Democratic process. It's not in the same universe as those nuts who blow themselves (and others) up over an ideology.
Serious question: do you feel threatened by people who use the political process to advance issues they believe in, if those issues are religiously motivated?
All those examples I mentioned are religious based. Christians are heavily against gay marriage and adoption of children by gay couples. They are against abortion - some are even against basic sexual education. They are in favor of teaching their religious dogma as a scientific theory (after covering it with the thinnest of veils). I could go on. As I said, nowhere near as virulent or extreme as Muslims. But is that really comforting? We are only taking about a difference in degrees here.
Do I feel threatened when people use the political process? Not really. I'm glad Christians are engaging in the political process and I applaud them for doing so. They deserve to be heard (even if I disagree with what they have to say).
I don't feel threatened because we have a robust Constitutional framework drafted by men smart enough to know to separate religion from politics and to not allow a majority to take away the rights of a minority by a simple majority vote.
Which is what I was getting to earlier: do you think, for a second, that the Christian wouldn't impose what he believes to be God's will on others if he could? Be careful in answering and remember your history lessons. Of course he would. But barred by the Constitution from instituting a theocracy, he will settle for implementing as much as he can.
It's the nature of the beast - men with power always seek more power. So do all these invented deities.