Bullcrap.
There isn’t a “liberation theology” in protestant churches because there are almost no protestant churches in South America, where liberation theology got it’s first hold.
I’ve been in several protestant churches as a guest, and the only church in which I could say I honestly heard something approaching “liberation theology” was the Unitarian Church, which is notoriously left-wing since the 60’s.
Actually mainstream Protestant sects are rife with Liberation Theology: http://www.pubtheo.com/page.asp?pid=1423
Notice how all the quotes cited in this article go back to the 1970s: http://www.religion-online.org/showarticle.asp?title=1832
I was referring to the social justice that most christian churches support. Social justice is another word for socialism and socialism is an other word for collectivism. Liberation theology is staple of black churches. I should have been more explicit.