What?

Secularism promotes limited government how? There are a lot of people in congress right now who are considered "secularists," but who haven't made much of an effort to shrink the size of the government.

Additionally, how does secularism help religion stay uncorrupted by politics? If religion tells people the way to live their daily lives, it will inherently impact politics. Secularism doesn't do anything to combat this... how could it?

The problem with the "Religious Right" is that they've gotten too powerful, and that they want to impose religion when they shouldn't. That is not to say, however, that secularism is without its faults. Instead of promoting a pause from religion, it too goes over the top, attempting to turn people into secularists, by actively keeping religion out of places where it's okay to be.

In other words, both groups are a bit over zealous in imposing their way of thinking on other people.

Religion is just another mean of claiming power over people, as money is. Unlike money, it is hopefully pretty easy to decide to be immune to it.