It is because the left sees people wanting to impose their own brand of faith on others, and having the power to do so, as scary. I doubt many here would want a pope-like person running this country and having the power to make law and enforce it. The baptists, as an example, would be screwed.
Their fear is irrational. The enemy is the Islamofascists. They don't just want to end abortion or gay marriage. They want to convert each and every one of us or kill us if we won't.
To equate Christians with the Islamofascists is insane.
They might see little green men running the pentagon, that doesn't mean that what they see is real. There is no evidence whatsoever that there are any people in the political leadership of the GOP who want any such thing.
And now we are approaching the reason for your epiphany, aren't we? First the epiphaino. Then the epitrepho. Then the anastarountas. It's how it always goes. (The participle's in the present to allow for you to change at any time, should a new epiphaino come around.)
You seem to be missing the fact that the left has its own brand of faith to impose on society. Their faith is not religious but they are as messianic as religious conservatives at imposing their agenda on everyone. I hate busybodies over anything else and the left is swarming with them.