Two interesting articles have appeared connecting conservative politics and control over the denominations. To be sure, a lot is at stake: the spirit of the nation... and lots of property.
the Christian left was instrumental in raising awareness about human rights and torture in Latin American during the 70's and 80's. It helped end Apartheid. It claimed the prophetic witness of social justice that has been ignored by the religious right - in part because such witness undermines the political ideology of the political right.
IRD, in particular, was formed in response to the sympathies of the religious denominations with those central American Organizations resisting the brutal dictatorships we were allied with.