There is no forgiveness in liberal and progressive Christianity. You put all your energy into correcting that which is wrong in the world, in line with the teachings of Christ, and when you succeed in making things better you are still expected to feel guilty. If there is nothing in the present to feel guilty about (and the right-on crowd can normally find something) then you are constantly reminded of how badly people who lived, sometimes hundreds of years before you were born, behaved.
In evangelical Christianity there is forgiveness for all who simply repent of their sins (you don't have to change the world or anything). They even have a formula for how this forgiveness works. I am pretty certain that this is the main reason why evangelicals are successful in growing churches and all that liberals are successful at is closing them.
I mean, who the heck, wants to feel guilty all their lives? Who wants to continue to feel bad about themselves when they have achieved something good? Only a masochist, a person who actually enjoys feeling sorry for themselves or who thinks that pretending to be worse than they actually are makes them, somehow, better than everyone else. If you get my drift.